Malicious PDF — malware analysis report

Static analysis result for SHA-256 8196f1c21ba8556b…

MALICIOUS

PDF

41.9 KB Created: 2020-08-26 05:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 052013cd408e1f151a176979537860ea SHA-1: 43b01ec93f34800f835962a747cfe3e169f81895 SHA-256: 8196f1c21ba8556b36881252724e7c370849bb90ba787d78e9c97f31ef112a5a
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'why you crying mama' and the malicious URL, suggesting a social engineering lure. The ML classifier strongly indicates maliciousness, and the presence of a malicious redirector link is a high-priority indicator.

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.cc/pify?keyword=why+you+crying+mama
    • http://files.dougzanderart.com/uploads/1/3/1/3/131398555/nudoboti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/6319/6310/files/gezaluxisuwinulobumonimuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/9649/7573/files/pradhan_mantri_awas_yojana_form_gujarati.pdf
    • https://cdn.shopify.com/s/files/1/0432/7571/4715/files/lagu_hanya_rindu_versi_inggris.pdf
    • https://cdn.shopify.com/s/files/1/0430/7668/1882/files/tratamiento_del_cancer_de_cervix.pdf
    • https://cdn.shopify.com/s/files/1/0432/9432/6944/files/identifying_long_vowel_sounds_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0435/9743/0941/files/enigma_of_amigara_fault.pdf
    • https://cdn.shopify.com/s/files/1/0437/9197/4557/files/purosub.pdf
    • https://cdn.shopify.com/s/files/1/0433/8312/8214/files/logic_games_bible_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/9017/3349/files/3536895413.pdf
    • https://cdn.shopify.com/s/files/1/0428/3075/8054/files/lasaxitiwobaxusimasinebu.pdf
    • https://cdn.shopify.com/s/files/1/0438/6911/0432/files/wuvumo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7863/9013/files/vikupisuzefoteximefis.pdf
    • https://cdn.shopify.com/s/files/1/0458/1484/1510/files/icivics_identify_that_government_answer_key.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b58.bin
34843df874d2cd2f385f62f74babd355191675f0a1f6c3c380a3dda619569e16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B58 4804 bytes
font_01_sfnt_off00006b7a.bin
5538f089c7a821a3392d895af205475431f590e4a9f59d9fb5bb3aacb81cd803		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B7A 9792 bytes
font_02_sfnt_off00008cf6.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF6 4324 bytes

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