Malicious PDF — malware analysis report

Static analysis result for SHA-256 71dd6cb98c3d6a28…

MALICIOUS

PDF

44.1 KB Created: 2020-08-25 12:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fcb18745300611500c27700d4a64246 SHA-1: 285d259d2b8862efdedcc150309ca4ce807c18d1 SHA-256: 71dd6cb98c3d6a283a3c2c771b3a825463f182d9c06f50fe10bceac094cc561a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with a critical heuristic firing for a malicious redirector and a link farm. The primary malicious URL identified is `https://ttraff.ru/pify?keyword=anpadh+movie+songs+pk`, which is likely used to distribute further malicious content or engage in SEO poisoning. 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.ru/pify?keyword=anpadh+movie+songs+pk
    • http://gokuzedi.bbcvbs.com/uploads/1/3/1/8/131857920/gabosorakamiluji.pdf
    • http://files.lickandapromisekennel.com/uploads/1/3/1/8/131856105/kisiluta_mejemoxopawefaw_lagepobupa_kanele.pdf
    • http://ruwigox.hendersonelectricmotor.com/uploads/1/3/1/3/131383664/761182e89466ab.pdf
    • http://rutedi.filmstillphotography.com/uploads/1/3/1/1/131164239/xuxerilaf.pdf
    • http://files.thepurpleturtleworkshops.com/uploads/1/3/1/4/131407465/pibol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/paxozusinobasulisoxobu.pdf
    • https://cdn.shopify.com/s/files/1/0445/6975/5812/files/cycling_gps_app_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0434/4391/2856/files/21953910848.pdf
    • https://cdn.shopify.com/s/files/1/0437/7162/5634/files/votepidoraxigozolesunasez.pdf
    • https://cdn.shopify.com/s/files/1/0432/2741/4696/files/sexijejizabiga.pdf
    • https://cdn.shopify.com/s/files/1/0436/1791/0946/files/sotodogukijujaxewagoz.pdf
    • https://cdn.shopify.com/s/files/1/0439/5335/6955/files/the_overcrowded_barracoon.pdf
    • https://cdn.shopify.com/s/files/1/0429/5216/3482/files/16531569837.pdf
    • https://cdn.shopify.com/s/files/1/0437/4154/4600/files/73019228556.pdf
    • https://cdn.shopify.com/s/files/1/0430/8615/1833/files/viwazolofuvipoxivafete.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058e5.bin
44b3036437da33ad6bf6ebae512264706d4875d6b90096f6cb54873ca8edeae5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58E5 5356 bytes
font_01_sfnt_off00006af5.bin
223eb472967915dd006c816486e60ae0c2a455bf7b3a90ebc43df5f761e75445		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF5 10248 bytes
font_02_sfnt_off00008e44.bin
bf3c06884a3d12198cb2155f035c903a1f13713504bbafa60c4a4513bdc58884		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E44 5892 bytes

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