Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c244f59f832453…

MALICIOUS

PDF

42.9 KB Created: 2020-08-20 22:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23f78515fa23bc9329a05e7608862c55 SHA-1: 59747a852b36424ca40abdddb7394e7f336507f7 SHA-256: 65c244f59f832453113e4990cae21b8561d8718c9594025d1128ee4b746429fc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a mass of external links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains the same redirector URL and references academic performance, suggesting a lure to trick users into visiting malicious sites. The ML classifier strongly indicated maliciousness, supporting the presence of a malicious redirector.

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=academic+performance+index+ugc
    • http://taras.wctherapygroup.com/uploads/1/3/2/6/132696056/tijozotolamawot-raniveruv-rupefewi.pdf
    • http://setixop.pascaline-preorder.com/uploads/1/3/1/3/131380500/suburokiwaduza.pdf
    • http://kixeg.alpinelegendspixiebobs.com/uploads/1/3/0/8/130873851/5ab12cf0013.pdf
    • http://guxabak.bensbackpack.com/uploads/1/3/2/8/132815154/wagovi.pdf
    • http://vobesup.janiceragoart.com/uploads/1/3/1/4/131453177/aae07e8e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/5660/4070/files/21531541394.pdf
    • https://cdn.shopify.com/s/files/1/0434/5387/4329/files/zivisikus.pdf
    • https://cdn.shopify.com/s/files/1/0430/9280/3744/files/93103646097.pdf
    • https://cdn.shopify.com/s/files/1/0437/5996/0218/files/this_is_america_music_video_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/2562/0374/files/vufotesetivibomafabapok.pdf
    • https://cdn.shopify.com/s/files/1/0437/6913/5262/files/67049272287.pdf
    • https://cdn.shopify.com/s/files/1/0427/7973/8278/files/zapomerobonetoniroj.pdf
    • https://cdn.shopify.com/s/files/1/0432/8059/7152/files/xuxovixiwibosor.pdf
    • https://cdn.shopify.com/s/files/1/0437/0753/1432/files/faburewusesolefari.pdf
    • https://cdn.shopify.com/s/files/1/0433/1326/6846/files/gidijotovupapilazik.pdf
    • https://cdn.shopify.com/s/files/1/0434/3319/7718/files/rumas.pdf
    • https://cdn.shopify.com/s/files/1/0435/8235/7663/files/54327836493.pdf
    • https://cdn.shopify.com/s/files/1/0432/4573/2007/files/57020257478.pdf
    • https://cdn.shopify.com/s/files/1/0430/1553/6793/files/34928982376.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_off000069d8.bin
136d37e4ee03d9e433c858221d14ff4c1d643f15b1d43f0c4f79cb80e6b2d478		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69D8 5320 bytes
font_01_sfnt_off00007bda.bin
f5bc706b15a77933c49a1f5e6007787f8d86e210b9e49c9ce5a7149e6f03f103		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BDA 10128 bytes

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