Malicious PDF — malware analysis report

Static analysis result for SHA-256 255bab983ec68abf…

MALICIOUS

PDF

49.5 KB Created: 2020-07-17 18:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: 904436216594ade0774380a6322950dc SHA-1: aff5449c0b260444301ab8c5049abbf0a82e7bb7 SHA-256: 255bab983ec68abf14062603b4c4d13eea408331942c14ca967296bca9722754
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious due to a critical heuristic firing for a PDF redirector link pointing to traff.com. Additionally, another critical heuristic detected a link farm containing numerous external PDF links, with many hosted on cdn.shopify.com. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of these link farms strongly suggests an attempt to drive traffic to malicious sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/wb?keyword=ipega%20pg-9023%20manual%20pdf In PDF document text
    • http://files.edargenziano.com/uploads/1/3/1/4/131453451/zomonisiwugijow.pdfIn PDF document text
    • http://files.brphotography100.com/uploads/1/3/1/4/131437508/556357.pdfIn PDF document text
    • http://files.sidleystandup.com/uploads/1/3/0/7/130775942/3089407.pdfIn PDF document text
    • http://files.cbysintranet.com/uploads/1/3/1/4/131454492/laboborav.pdfIn PDF document text
    • http://files.bambooartscenter.com/uploads/1/3/1/8/131857071/pujeriwetid-napofemerumaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9823/5289/files/68774891991.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6463/1195/files/26237796149.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7046/3895/files/62723733382.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mujunevuduw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8933/0325/files/18026361296.pdfIn PDF document text
    • https://bopojidu.files.wordpress.com/2020/07/13908597284.pdfIn PDF document text
    • https://rovizemafogi.files.wordpress.com/2020/06/94773369271.pdfIn PDF document text
    • https://kozaxijewob.files.wordpress.com/2020/07/14015863753.pdfIn PDF document text
    • https://zawonaj.files.wordpress.com/2020/06/60972892613.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6385/2712/files/89057679587.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/xuzunuwomepixusepoxubego.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2149/1621/files/jopokepufu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1675/7153/files/86465992911.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0645/2131/files/2238511756.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7512/5923/files/40193469796.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0876/1764/files/megit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6844/8152/files/tugisemoruzefekojovovuwu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8318 5296 bytes
SHA-256: 8084eb3a9498f749c3a8b8fbac582a1ec73dc63b1d7965a1e04b9189c5643fbe
font_01_sfnt_off00009502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9502 10276 bytes
SHA-256: a0d4c3f2d11d7b5e7980d0fc9f17b3447bc8b4b11a1f9f7bf0e7c1a0a222c093