Malicious PDF — malware analysis report

Static analysis result for SHA-256 136bddd074babb46…

MALICIOUS

PDF

51.7 KB Created: 2020-08-05 04:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5cc289cad384b84a35e192b34a1956a8 SHA-1: e01d077c821df8fe58f775ba57641961b42243e9 SHA-256: 136bddd074babb4680e05bcd63ac3b5530a9456bff1d44b259def5380fa76f48
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link redirects to a known malicious infrastructure. The document body, though heavily obfuscated, contains text related to 'Ameritrade ira terms of withdrawal pdf', suggesting a phishing lure. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector link indicates an attempt to lead the user to a malicious site.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.cc/pify?keyword=ameritrade+ira+terms+of+withdrawal+pdf
    • http://files.taleford.net/uploads/1/3/1/3/131383297/64ea1708278b5.pdf
    • http://files.bradleystokejudo.com/uploads/1/3/1/4/131406714/jipulofo.pdf
    • http://files.singersandactorsworkshop.com/uploads/1/3/2/7/132740218/mubazaxumadajag.pdf
    • http://files.ccsb.danafarberdev.org/uploads/1/3/1/4/131437249/6374087.pdf
    • http://files.cruisecontroll.org/uploads/1/3/0/7/130740573/dosiki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2884/8538/files/tourner_dans_le_vide_english_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0438/2926/4546/files/sosefukixepax.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasodidupafulad.pdf
    • https://cdn.shopify.com/s/files/1/0431/8298/1281/files/tunuravimakasaluxa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/loxidunadubufurepetiverox.pdf
    • https://cdn.shopify.com/s/files/1/0447/9402/0000/files/google_chromecast_wallpapers.pdf
    • https://cdn.shopify.com/s/files/1/0439/2094/9403/files/lifexevojisedafojevam.pdf
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/bozutulid.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dogazuzotefoninu.pdf
    • https://cdn.shopify.com/s/files/1/0427/4244/8295/files/wapeboluzugepeloj.pdf
    • https://cdn.shopify.com/s/files/1/0429/0609/1673/files/91062207320.pdf
    • https://cdn.shopify.com/s/files/1/0437/1818/1016/files/22134116423.pdf
    • https://cdn.shopify.com/s/files/1/0434/2117/1864/files/83561197096.pdf
    • https://cdn.shopify.com/s/files/1/0428/8118/8003/files/tixujeposedalafawo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008ad4.bin
461e8eeee8ffe5c09f5fcf2f68659e18b6e3ffadf7c37ef2b7440cb7132ce5b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AD4 5364 bytes
font_01_sfnt_off00009cf7.bin
e1a96482a0d401f3925b57621d1ce88cea4c11441ef145b1116fe0ec2dae1f68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CF7 10816 bytes

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