Malicious PDF — malware analysis report

Static analysis result for SHA-256 5670d7729255e5f0…

MALICIOUS

PDF

46.6 KB Created: 2020-07-22 12:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: acbc4bcc7d2f999302d3d6ac82d42f78 SHA-1: 7fd201a79d40ea95f139b508a7a6ff2fb3273418 SHA-256: 5670d7729255e5f07eedbffc45674576865e73e097795eed22de75150ed1e796
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body is heavily obfuscated, but the presence of numerous links suggests a lure to external malicious content. The primary attack pattern involves redirecting users to potentially harmful websites.

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=h%20g%20wells%20the%20shape%20of%20things%20to%20come%20pdf In PDF document text
    • http://files.mylittlebugs.org/uploads/1/3/1/8/131857402/b8fcfb51af.pdfIn PDF document text
    • http://files.pondsidestudio.net/uploads/1/3/2/6/132681536/e4f14.pdfIn PDF document text
    • http://files.heuveltonfire.com/uploads/1/3/2/8/132814427/9a331b68a02.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/1/0434/3165/7638/files/pujegotuzefusoliwuwif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/figarawevig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7401/0782/files/bitimurobi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2344/8736/files/44265722739.pdfIn PDF document text
    • https://megujujuget.files.wordpress.com/2020/06/zezuborago.pdfIn PDF document text
    • https://wakogokanexu.files.wordpress.com/2020/07/guxilavuvadojojegova.pdfIn PDF document text
    • https://sabiduzan.files.wordpress.com/2020/07/bejifolalujumojiwo.pdfIn PDF document text
    • https://sixawawomexa.files.wordpress.com/2020/06/12615261086.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4839/4142/files/37158752099.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5737/3589/files/tazodavur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0272/4506/files/gejujufexurafitumonavu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8027/8426/files/lewide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0128/2711/files/13802298832.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2973/2248/files/73488765371.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fasexerogetotano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0185/5646/files/mejiwonawolojazuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0235/6127/files/91809659805.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_off00007616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7616 5312 bytes
SHA-256: b6d262daa05567a3b11755ee079933028432a360d02c6b2b3601b14ba591bb4b
font_01_sfnt_off0000880e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x880E 10744 bytes
SHA-256: 42a9935b99d18e79f65a270942a006f6bb085f0ffc9c397e08fd3ddf19301ccc