Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f3c875d3388574…

MALICIOUS

PDF

57.1 KB Created: 2020-08-16 14:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10c9230487d464f2f3b5567e496c7cba SHA-1: 11b9350b8fbe5930ac4c115abae08e5100d5c476 SHA-256: 81f3c875d338857461adfaddaf480960984803831d2d2d8c8f6e530ed854c226
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 external PDF files, suggesting a link farm for SEO manipulation or to host malicious content. One prominent URL, 'https://ttraff.cc/pify?keyword=metal+forming+process+lecture+notes+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this same URL, indicating its likely purpose is to trick users into clicking through to malicious infrastructure.

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=metal+forming+process+lecture+notes+pdf
    • http://pabeminu.yesandventure.com/uploads/1/3/1/6/131606490/a2fdbeb96e.pdf
    • http://files.carpenterbeeinteriors.com/uploads/1/3/0/8/130813821/repenunududebibu.pdf
    • http://lisuzufab.frabranch159.com/uploads/1/3/1/4/131410227/278af976564a133.pdf
    • http://nupesos.g-n-o.com/uploads/1/3/1/3/131380845/2423267.pdf
    • http://files.infinitemansummit.com/uploads/1/3/1/3/131378899/baxunakasanafam-pavimusubu-fumim-kudiziwokodusur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9095/9766/files/wolf_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0429/1582/3772/files/59697219868.pdf
    • https://cdn.shopify.com/s/files/1/0433/9020/6115/files/9679117008.pdf
    • https://cdn.shopify.com/s/files/1/0440/1253/5958/files/commutative_property_of_multiplication_worksheets_3rd_grade.pdf
    • https://cdn.shopify.com/s/files/1/0429/7677/2250/files/40118344464.pdf
    • https://cdn.shopify.com/s/files/1/0434/6770/2432/files/landing_page_design_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/8073/6156/files/62831033247.pdf
    • https://cdn.shopify.com/s/files/1/0428/6509/8908/files/99338239394.pdf
    • https://cdn.shopify.com/s/files/1/0433/9220/4950/files/jijifodowowab.pdf
    • https://cdn.shopify.com/s/files/1/0435/2137/6410/files/tumabazixesitile.pdf
    • https://cdn.shopify.com/s/files/1/0429/6540/1753/files/12682575182.pdf
    • https://cdn.shopify.com/s/files/1/0439/5961/5646/files/sultan_movie_song_bulleya_ringtone.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009ffe.bin
8a532a1fe27332db8fe6f55c3f6e1725071113b6232ee0185b089a4fa2d22850		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FFE 5480 bytes
font_01_sfnt_off0000b292.bin
f51313f68a6a16409d9f91be4c5ca2e122c1ff539e057433c72041a7c5bc94e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB292 10724 bytes

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