Malicious PDF — malware analysis report

Static analysis result for SHA-256 099b091442d547e4…

MALICIOUS

PDF

42.6 KB Created: 2020-08-19 04:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79ecfc4dcd697864140a19ddff698502 SHA-1: 339cf05fc472b13762a2e28dec68295ea4a5471b SHA-256: 099b091442d547e4edf1abfbb5f3252df69d6036d04eef87b30224376cb81dc8
174 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=block+quote+bluebook+format', which is flagged as malicious. The presence of a large number of external PDF links suggests a link farm or a method to obscure the final malicious destination. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=block+quote+bluebook+format
    • http://files.organicallyhers.com/uploads/1/3/1/0/131070238/gomuwu.pdf
    • http://files.cobbosseeconteesnowmobileclub.com/uploads/1/3/0/7/130740033/4865357.pdf
    • http://tufutisij.okmulgee7.com/uploads/1/3/1/6/131606066/wepebiwu.pdf
    • http://fofebab.willardband.org/uploads/1/3/0/8/130874388/senagupugiz_pulilagon_jejegebokafurin_ronomebom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/3046/3142/files/35640224060.pdf
    • https://cdn.shopify.com/s/files/1/0429/1880/5657/files/83178625643.pdf
    • https://cdn.shopify.com/s/files/1/0433/8909/1998/files/80690145343.pdf
    • https://cdn.shopify.com/s/files/1/0431/0840/1316/files/generator_bank_7_days_to_die.pdf
    • https://cdn.shopify.com/s/files/1/0435/8432/3741/files/64267450847.pdf
    • https://cdn.shopify.com/s/files/1/0429/9345/1159/files/fundamentals_of_computer_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5377/files/pelaberedutalixeparedu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/fifopoxuwadezalebibenana.pdf
    • https://cdn.shopify.com/s/files/1/0435/2851/9832/files/que_significa_acopio_de_informacion.pdf
    • https://cdn.shopify.com/s/files/1/0430/8982/1845/files/14372509804.pdf
    • https://cdn.shopify.com/s/files/1/0433/8886/2622/files/lonely_island_songs.pdf
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/wosekerurojifomogodasir.pdf
    • https://cdn.shopify.com/s/files/1/0434/1340/5850/files/faktor_hedonisme.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_off00006a09.bin
1c315e6e7dc19c0161c6082428ad35dd076d99b47a6ff18db946de19b5b88477		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A09 5228 bytes
font_01_sfnt_off00007bc6.bin
9cea463142d9bbaa4d7458bbfc56eeec71d14188258948c00bc0f2aa9102a662		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BC6 9848 bytes

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