Malicious PDF — malware analysis report

Static analysis result for SHA-256 a771dec0199bbfec…

MALICIOUS

PDF

48.0 KB Created: 2020-08-12 05:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e34321bdf2d1a47c89ea2e5bf2b9023c SHA-1: 4fa8e158ccc219be74427f2218bb57bf747b8ca5 SHA-256: a771dec0199bbfec51aca2336d0c105ad8f93e48262285977784c6535f4b5d1d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources. One critical heuristic firing indicates a malicious redirector link to 'ttraff.com', suggesting a phishing or malware distribution attempt. The document body, though partially corrupted, contains keywords related to literature and PDF, likely as a lure. The presence of a large number of external links, many pointing to Shopify domains, further supports the link farm hypothesis.

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.com/pify?keyword=neoclassicismo+e+preromanticismo+letteratura+pdf
    • http://files.jesimall.com/uploads/1/3/0/9/130969158/kekolitedemide-vetedaleluxitev.pdf
    • http://kebirip.elliottencarnacion.com/uploads/1/3/0/8/130874064/kawonogus_pufowejo_biwuga_zeserej.pdf
    • http://fazot.dominicrohangates.com/uploads/1/3/0/7/130739718/2bc0a097b80c.pdf
    • http://files.campblodgett.org/uploads/1/3/0/8/130814124/5124895.pdf
    • https://cdn.shopify.com/s/files/1/0437/0608/9640/files/all_metal_melting_point_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/9502/4023/files/modude.pdf
    • https://cdn.shopify.com/s/files/1/0451/4159/0170/files/configuration_bgp_cisco.pdf
    • https://cdn.shopify.com/s/files/1/0438/8772/2648/files/mack_mclaughlin_ocoee_fl.pdf
    • https://cdn.shopify.com/s/files/1/0439/6944/6046/files/kindle_paperwhite_email.pdf
    • https://cdn.shopify.com/s/files/1/0432/1319/3373/files/english_grammar_book_free_download_for_bank_exams.pdf
    • https://cdn.shopify.com/s/files/1/0440/6378/5112/files/xigusukutetobixabel.pdf
    • https://cdn.shopify.com/s/files/1/0430/3293/6605/files/ios_9_user_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/7494/5184/files/crimson_skies.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/amir_levine_rachel_heller_attached.pdf
    • https://cdn.shopify.com/s/files/1/0441/0081/2952/files/apnea_obstructiva_del_sueo_y_anestesia.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5805/files/36596827677.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007dd5.bin
5c9b0622ba0c2d400c5cf5fe044704d29d6e18d8bafb92f87a6c5abafd340af9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD5 5268 bytes
font_01_sfnt_off00008fa5.bin
a9f58eff8725dcda89725d0954e52b32468001f71b3958dae4b452eae162e8db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FA5 10804 bytes

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