Malicious PDF — malware analysis report

Static analysis result for SHA-256 685f7e9743f7764b…

MALICIOUS

PDF

39.2 KB Created: 2020-08-21 02:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9cf103fccb1863470066fdbd408bdf44 SHA-1: aac8470422c853fe8f718e8edf392a259ef3580d SHA-256: 685f7e9743f7764bf3dc4d45f58215edd91ce846c3b79f3f0391fc461492dcc1
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 a redirector service designed to obscure the final destination. The primary malicious URL identified is a redirector that uses keywords related to free studio background photos to entice clicks. The ML classifier strongly indicates maliciousness, and the overall structure suggests a link farm or SEO spam tactic used to distribute malicious content.

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=studio+background+photos+free
    • http://files.artismylife.us/uploads/1/3/0/8/130814106/lukuzobikuvamipobo.pdf
    • http://files.ecologicing.com/uploads/1/3/0/7/130776046/46750abf8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/7767/1843/files/38242082308.pdf
    • https://cdn.shopify.com/s/files/1/0432/8708/5222/files/aporofobia_completo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9535/0684/files/archinterior_vol_39.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nosisuzamozozi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4066/0904/files/zekubedopozavimeselozotej.pdf
    • https://cdn.shopify.com/s/files/1/0434/1032/5671/files/boult_audio_tru5ive_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/9646/5823/files/micro_enterprise_definition.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43034806536.pdf
    • https://cdn.shopify.com/s/files/1/0432/4448/6824/files/81034413534.pdf
    • https://cdn.shopify.com/s/files/1/0434/5505/3989/files/affairs_cloud_july_2020_weekly.pdf
    • https://cdn.shopify.com/s/files/1/0431/4506/8699/files/lojevinezi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5600/files/17751689911.pdf
    • https://cdn.shopify.com/s/files/1/0434/0727/8238/files/fegalufijanub.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_off00004e53.bin
2e309ea27afd49cd6d8ea2843eb641d0a6cb2b352d268fb3cfe3065da042b412		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E53 5576 bytes
font_01_sfnt_off0000612f.bin
5c5e35b15a968bddc81654da9cdd7664c846d14ee6fb3898c0b61e59d7778b11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x612F 9560 bytes
font_02_sfnt_off000081d9.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81D9 4324 bytes

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