Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4154f06f7aa57e7…

MALICIOUS

PDF

55.3 KB Created: 2020-07-20 14:38:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 93007bf5d6dd921c808e348235472c07 SHA-1: fb556904c3688e3d8702f96bef11c406813a4fbe SHA-256: f4154f06f7aa57e779b4d0c7e73a20002ae1badb670167267063a4a6b6cb95f8
194 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, a common tactic for redirecting users to malicious websites. One heuristic specifically flags the document as a 'PDF_MALICIOUS_REDIRECTOR_LINK', pointing to 'ttraff.ru'. Another heuristic identifies it as a 'PDF_SEO_LINK_FARM', indicating a large number of external links, with 'cdn.shopify.com' being a prominent host. These findings suggest the document's primary purpose is to lure users to potentially harmful content through a network of links.

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.ru/wb?keyword=percepcion%20gestalt%20pdf In PDF document text
    • http://files.azerothmillionaire.com/uploads/1/3/0/7/130776327/faxukofejeto.pdfIn PDF document text
    • http://files.catherinemorland.com/uploads/1/3/1/3/131379223/sidirovapidufaf.pdfIn PDF document text
    • http://files.byucssa.org/uploads/1/3/1/4/131453100/zatulija_minonakanadab.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/1/0431/2429/3794/files/mimopowajesakujejaxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6019/1641/files/28103145466.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5540/7511/files/zimof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1308/7142/files/jukodabuvaxereb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8999/2605/files/60835363329.pdfIn PDF document text
    • https://rabimigoliv.files.wordpress.com/2020/06/31139023056.pdfIn PDF document text
    • https://bifatapir.files.wordpress.com/2020/06/xoveriwakufikitajon.pdfIn PDF document text
    • https://mebusevodon.files.wordpress.com/2020/07/kixara.pdfIn PDF document text
    • https://xenexusese.files.wordpress.com/2020/06/72074123180.pdfIn PDF document text
    • https://judetirada.files.wordpress.com/2020/07/butuxapitojes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8493/8390/files/xolutelapevel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8321/9619/files/dexopolowu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8924/8924/files/67190938058.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4131/7276/files/70037543825.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3516/4835/files/tavip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7035/6632/files/82330570728.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4526/5318/files/19442815018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2483/4975/files/wurij.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_off00009896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9896 5112 bytes
SHA-256: 218480994546a08d4487be7379defa5c24b66adca03218bdd11cb300f7989af6
font_01_sfnt_off0000a9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9F6 11172 bytes
SHA-256: 7c7f22b4696e877fbd13a7de866deb5a89b25621fa42ee10144cafa9ed29c08e