Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c76855e83c2f290…

MALICIOUS

PDF

49.8 KB Created: 2020-08-11 09:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef1bc2d254eae546d693480cea3cb167 SHA-1: e95496964cd9e5f5f1c67123fb5d904ae5c8ae5a SHA-256: 7c76855e83c2f290a4cd4f1d4d2ba2b15a552884412b0e1470e5ec292dfcf02b
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a link to a PDF about learning English. The PDF also contains a large number of external links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive document body and malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/pify?keyword=como+aprender+ingles+britanico+pdf
    • http://xanuk.windsorstgeorgerotary.org.uk/uploads/1/3/0/8/130873927/kokojofesige.pdf
    • http://files.dvowfoxvalley.org/uploads/1/3/2/7/132740845/zazaxuwozapawot.pdf
    • http://files.saralamnin.com/uploads/1/3/1/1/131164538/jaxuvemepelijog_tunuvabe_xozep.pdf
    • http://files.raggz.org/uploads/1/3/1/8/131871852/9824045.pdf
    • http://files.baysidecapecoral.com/uploads/1/3/0/8/130874490/b441d8a8edd84f2.pdf
    • https://cdn.shopify.com/s/files/1/0431/1495/4908/files/tobok.pdf
    • https://cdn.shopify.com/s/files/1/0431/8072/0294/files/letedejexaref.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/76640573288.pdf
    • https://cdn.shopify.com/s/files/1/0445/6860/8927/files/how_to_find_the_mode.pdf
    • https://cdn.shopify.com/s/files/1/0432/5045/0600/files/elder_chaos_druid_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0431/0899/1142/files/46443225768.pdf
    • https://cdn.shopify.com/s/files/1/0437/2434/1400/files/93411963167.pdf
    • https://cdn.shopify.com/s/files/1/0434/0360/8231/files/accounting_and_finance_an_introduction_8th_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/4021/1105/files/ansi_c80_1.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/lewoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/1129/2829/files/68937553075.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006811.bin
2c1fca21f323318f7b31084e74fad8791b482189f41183df7418607fda1ef3b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6811 5520 bytes
font_01_sfnt_off00007ab5.bin
55be1415c271a3d2f2eccde64da9b6845ec970a37f0f3cf75e29570a846e40de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB5 11912 bytes
font_02_sfnt_off0000a1b2.bin
f8ae70fe08f3f51d233476c189f9f1652579ab6257c6fb20d6d7e0d9487939ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1B2 16616 bytes

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