Malicious PDF — malware analysis report

Static analysis result for SHA-256 604b7b24430fd3a4…

MALICIOUS

PDF

42.3 KB Created: 2020-08-09 11:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31237e03d9330fdf811323129d02186e SHA-1: f641c4a93ec383a72702fd11c6249e1820172196 SHA-256: 604b7b24430fd3a4a1118776f8a8dee25e1a614cf3c4cbc26db8b82677a6b9fb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains text related to 'characteristics of fifth generation computers pdf' and includes URLs that appear to be part of a link farm designed to attract traffic. This suggests a phishing or SEO poisoning attack, aiming to redirect users to potentially harmful sites.

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=characteristics+of+fifth+generation+computers+pdf
    • http://files.heartlandracingco.com/uploads/1/3/1/4/131483830/40dd82045.pdf
    • http://files.hvtelovestudio.com/uploads/1/3/1/0/131070888/6274884.pdf
    • http://files.mvialions.org/uploads/1/3/1/3/131381540/kejanajiveburibigalo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0305/1171/files/donapowofubeve.pdf
    • https://cdn.shopify.com/s/files/1/0434/5466/0770/files/89641698659.pdf
    • https://cdn.shopify.com/s/files/1/0438/2995/2674/files/87202309272.pdf
    • https://cdn.shopify.com/s/files/1/0432/0316/6369/files/52955053131.pdf
    • https://cdn.shopify.com/s/files/1/0431/6702/3259/files/37419422208.pdf
    • https://cdn.shopify.com/s/files/1/0431/1089/1682/files/berker_1930.pdf
    • https://cdn.shopify.com/s/files/1/0440/9350/5688/files/2017_f150_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/8774/9525/files/vukosipitavesozomo.pdf
    • https://cdn.shopify.com/s/files/1/0429/4361/1036/files/kenmore_refrigerator_side_by_side.pdf
    • https://cdn.shopify.com/s/files/1/0447/3012/2393/files/life_together_dietrich_bonhoeffer.pdf
    • https://cdn.shopify.com/s/files/1/0438/7491/0376/files/sewikusepojesob.pdf
    • https://cdn.shopify.com/s/files/1/0434/7763/1126/files/69033028983.pdf
    • https://cdn.shopify.com/s/files/1/0432/7286/3904/files/pdf_to_dwg_online.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_off00006813.bin
1f73b490799bce1a449b167a404a7b8c637d6cb8ce775b8264f00779cd58ce76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6813 5440 bytes
font_01_sfnt_off00007a63.bin
7abdfc276ef5c7648538796785317bc6b0010ce0bd1f8cbb8055e7b084687ccb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A63 9852 bytes

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