Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e36cc9f2f545a3…

MALICIOUS

PDF

44.7 KB Created: 2020-09-06 12:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07768ab0d3dc57fea363d9a67341b308 SHA-1: 1849e14aab4bbc691cb0431f38f6d14c0f38233c SHA-256: 87e36cc9f2f545a34c334044b75db4289ae8019d03e9767d3897177a3beb7f35
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.link/wix?keyword=passive+form+verb+in+english, which is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other links to PDF files hosted on static.usrfiles.com, suggesting a link farm or redirection scheme. The ML classifier also strongly indicated maliciousness.

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.link/wix?keyword=passive+form+verb+in+english
    • https://static.usrfiles.com/ugd/8f6098_16ada3cfcc3644759f5968af48096251.pdf
    • https://static.usrfiles.com/ugd/e2c6c1_47a800e24f014131a896bf77f5030e66.pdf
    • https://static.usrfiles.com/ugd/764aaa_24804259c3ba4696a94aba483e9ec81d.pdf
    • https://static.usrfiles.com/ugd/008e52_161a850ba43540cfb286fbcfeab55594.pdf
    • https://static.usrfiles.com/ugd/4ca7f5_df47bb4c7df748eaba1ecbfec5cecc4c.pdf
    • https://static.usrfiles.com/ugd/d902bb_8658e1453f6c418499ee3e400680d425.pdf
    • https://static.usrfiles.com/ugd/8d57bd_3ed14686857640e18354cb529deadb2c.pdf
    • https://static.usrfiles.com/ugd/dc8a8e_1925fee36fa74070ae18355c01e231a1.pdf
    • https://static.usrfiles.com/ugd/33ab24_caa86e83148942e68c6f841cc7b6c079.pdf
    • https://static.usrfiles.com/ugd/217b8a_5ed713f3a062457fbc762185c4d2483c.pdf
    • https://cdn.shopify.com/s/files/1/0452/6129/1680/files/asfixia_libro_descargar.pdf
    • https://cdn.shopify.com/s/files/1/0435/7927/7467/files/deconstruction_and_critical_theory.pdf
    • https://cdn.shopify.com/s/files/1/0435/1187/3688/files/pulse_oximeter_file.pdf
    • https://cdn.shopify.com/s/files/1/0428/4517/5971/files/rukarimenibefozazuliroji.pdf
    • https://cdn.shopify.com/s/files/1/0431/8363/6644/files/sanyo_television_repair.pdf
    • https://cdn.shopify.com/s/files/1/0430/6960/4001/files/fawitaxitidokalupa.pdf
    • https://cdn.shopify.com/s/files/1/0434/6255/7856/files/filozitolasiwaxofigom.pdf
    • https://cdn.shopify.com/s/files/1/0431/8219/4847/files/54127094009.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_off0000645c.bin
6710ca28f6fbcb8a2f61754de007027187a4aabfc25eec4ff731257cb43c373c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x645C 5088 bytes
font_01_sfnt_off00007575.bin
1bcc56c3125362ac0cd3a93553652178edfa3a483ac74a66f720c4fd322d5220		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7575 10012 bytes
font_02_sfnt_off000097af.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97AF 4324 bytes

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