Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a56843c4da5873…

MALICIOUS

PDF

49.4 KB Created: 2020-08-31 00:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d954b5a913bcc0673af44d348dd00b05 SHA-1: 519982b49ef987fb2c1bbab74b1ff6eccaff81d9 SHA-256: c9a56843c4da58731aa51a5565c0730036ce176f532f0d95fd76d6a596cf9180
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to a redirector service (ttraff.ru). This indicates a link farm strategy, likely for SEO poisoning or to lure users to malicious sites. The ML classifier also strongly flagged this PDF as malicious. While the document body contains garbled text, the presence of the redirector URL is the primary indicator of malicious intent.

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/wix?keyword=summation+formulas+and+properties+pd
    • https://cdn.shopify.com/s/files/1/0448/3586/4736/files/ccna_security_study_guide_tim_boyles.pdf
    • https://cdn.shopify.com/s/files/1/0431/2281/9233/files/skip_and_shannon_podcast.pdf
    • https://cdn.shopify.com/s/files/1/0435/1809/9615/files/lilosawamematokazegujiki.pdf
    • https://cdn.shopify.com/s/files/1/0432/0795/0495/files/suvoluzibefa.pdf
    • https://cdn.shopify.com/s/files/1/0435/5486/5320/files/jazewewax.pdf
    • https://static.usrfiles.com/ugd/0dd040_03659400082f4f22a01ef0c0fa7ad1de.pdf
    • https://static.usrfiles.com/ugd/cd79e3_17449061749d403598088fc1c63c7dc1.pdf
    • https://static.usrfiles.com/ugd/c20ea7_8a90d7e18a5e41868de4e56507bd9063.pdf
    • https://static.usrfiles.com/ugd/b91566_1ef40febb6b1486fb25176e4507c5356.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0945/files/coombs_test_interpretation.pdf
    • https://cdn.shopify.com/s/files/1/0428/4055/5687/files/33298255129.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5312/files/gujozadugaxugofutoganel.pdf
    • https://cdn.shopify.com/s/files/1/0437/2830/6341/files/98662876998.pdf
    • https://cdn.shopify.com/s/files/1/0434/7671/3637/files/coordinating_conjunctions_worksheets_grade_8.pdf
    • https://cdn.shopify.com/s/files/1/0429/4184/1571/files/fake_text_message_apk_pro.pdf
    • https://cdn.shopify.com/s/files/1/0438/2566/0066/files/vilosel.pdf
    • https://cdn.shopify.com/s/files/1/0430/0252/7897/files/8765042376.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_off0000638e.bin
88cbf9ca8b09bb4753d77ac7cc3206674a0b83db7c0e060bcc840ec3b509e9f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x638E 5292 bytes
font_01_sfnt_off00007570.bin
f56d25256aab5cf393c335157a2a5d05008f6b4466faba4939d1286ab4372982		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7570 14172 bytes
font_02_sfnt_off0000a301.bin
b221ac204eac84f063a17005b135ac4dbee82ee40fd9efb859667a6a8b2ed001		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA301 16084 bytes

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