Malicious PDF — malware analysis report

Static analysis result for SHA-256 7586f725bd909f10…

MALICIOUS

PDF

38.0 KB Created: 2020-08-14 20:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09691394e3cd3b1108e0c5797343f1bc SHA-1: c21befed2fce34cca698af09a0d9e9a34853d887 SHA-256: 7586f725bd909f10f7cb35a489cf2a42f5070b3eb023841556395f59fd8e4be8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, with one prominently leading to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to 'colour blindness ppt' and includes the malicious URL. The ML classifier strongly indicates maliciousness, and the presence of numerous external PDF links suggests a link farm or redirection strategy.

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=colour+blindness+ppt
    • http://fatumavus.shazzad.net/uploads/1/3/1/4/131437987/dukexofa.pdf
    • http://sipukizuw.mylovableschnauzers.com/uploads/1/3/1/8/131871486/nujoxebexezum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5693/8646/files/32419086446.pdf
    • https://cdn.shopify.com/s/files/1/0429/0550/1852/files/93701984706.pdf
    • https://cdn.shopify.com/s/files/1/0430/2841/4618/files/38711365694.pdf
    • https://cdn.shopify.com/s/files/1/0432/8049/8852/files/zafiwugamawijobot.pdf
    • https://cdn.shopify.com/s/files/1/0437/0703/9895/files/pdf_file_to_word_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/logopazunu.pdf
    • https://cdn.shopify.com/s/files/1/0436/0352/5790/files/15802456072.pdf
    • https://cdn.shopify.com/s/files/1/0433/4521/5656/files/mamomuzasinoguvijanuzavod.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_off0000588a.bin
a592043329b87c67274c7b3e904494d56e36b73eb6a9e3d9807c1b00a530e57a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x588A 4788 bytes
font_01_sfnt_off000068d5.bin
e3168b1a1e7d7c1642128a3ab16d3fa67d1dfcb5ea4a09f53b321d53cf5f6f87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68D5 10256 bytes

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