Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5475a70b9e4b188…

MALICIOUS

PDF

47.6 KB Created: 2020-09-05 12:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1afc757f059d781867fac9a3966e0886 SHA-1: dd5b7b880dc67f729b50ad10949ba3cd20e3bd29 SHA-256: a5475a70b9e4b18860060af178af9bfaaa6aff8839585d38ff95f5d51c062942
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=factoring+quadratics+algebra+2+worksheet'. This URL is presented within the document body, disguised as an academic worksheet, to entice users to click. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many of which point to Shopify and static.usrfiles.com domains, suggesting an attempt to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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.me/wix?keyword=factoring+quadratics+algebra+2+worksheet
    • https://cdn.shopify.com/s/files/1/0437/6349/9159/files/ludibitisejuvilutudasizoj.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5807/files/40651302221.pdf
    • https://cdn.shopify.com/s/files/1/0431/4152/9762/files/natafobojudodunax.pdf
    • https://cdn.shopify.com/s/files/1/0435/9267/9582/files/youth_ministry_intern_job_description_template.pdf
    • https://cdn.shopify.com/s/files/1/0457/7545/4374/files/37937574175.pdf
    • https://static.usrfiles.com/ugd/b8c837_82e8055f5a22495692bf1ad55f98445c.pdf
    • https://static.usrfiles.com/ugd/361045_2540987fd1d543a09f2b1c598511b401.pdf
    • https://static.usrfiles.com/ugd/b8c837_36c6dc174ab740968a63cd7562d895ce.pdf
    • https://static.usrfiles.com/ugd/eb5a6a_f7684180f4bb4417a85bc45b201c9a9e.pdf
    • https://static.usrfiles.com/ugd/1d64af_9fc60756d45b4ad7ae371422641a25e5.pdf
    • https://static.usrfiles.com/ugd/8de238_6ef6365d58274502af60b3b4bb51554f.pdf
    • https://static.usrfiles.com/ugd/b6edda_f99e45c4afe64ba8985c25734c71bc34.pdf
    • https://static.usrfiles.com/ugd/a6e5e9_32291abef57144cea822e740515cf9fc.pdf
    • https://static.usrfiles.com/ugd/b8c837_31e591a6907047dc93217a5834b16001.pdf
    • https://cdn.shopify.com/s/files/1/0431/4054/6714/files/mogitabexoruzegiladev.pdf
    • https://cdn.shopify.com/s/files/1/0433/5622/5686/files/18635144530.pdf
    • https://cdn.shopify.com/s/files/1/0433/6189/4565/files/28094610899.pdf
    • https://cdn.shopify.com/s/files/1/0433/4583/8232/files/gateduvoxapeludegozigi.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_off00006e07.bin
a73f1944a3a31bd0abe60c6e17346d1b48c6f27645d17c69047d3418b2dc25bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E07 5592 bytes
font_01_sfnt_off00008108.bin
e1824316c96175609aba746d210b115be8e4b014e3b3db2de40aef3c3f3c73f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8108 10016 bytes
font_02_sfnt_off0000a2c8.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2C8 4324 bytes

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