Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b6040004f03f7c…

MALICIOUS

PDF

44.2 KB Created: 2020-08-14 16:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1333ab0bf1d11f3066bbed0d2d7cbbf7 SHA-1: 362b6117a22802e477374ed149188e8385807f53 SHA-256: d5b6040004f03f7cea956fc765baa34046ac0cb4a38b0e62d7b980d9e88b0aee
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains a large number of embedded links, many of which point to benign Shopify domains, but one critical link redirects to a known malicious domain. The ML classifier strongly indicated maliciousness. The primary attack vector appears to be a link farm designed to lure users to malicious infrastructure, likely for further exploitation or phishing.

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/wb?keyword=self%20analysis%20questions%20pdf
    • http://nijutoz.muskmeloncreative.com/uploads/1/3/1/8/131871921/c6bc160a951df7.pdf
    • http://files.streetdreamcreations.com/uploads/1/3/0/7/130776655/lotabaxev.pdf
    • http://files.firstenglishchurch.com/uploads/1/3/0/7/130738568/4acff74bfcde6.pdf
    • http://files.talking-feet.com/uploads/1/3/1/3/131384424/6976648.pdf
    • http://files.airbyanthony.net/uploads/1/3/1/3/131384663/ab19413.pdf
    • https://cdn.shopify.com/s/files/1/0449/7974/9022/files/numerical_reasoning_test_practice.pdf
    • https://cdn.shopify.com/s/files/1/0437/6553/0785/files/baofeng_bf-_888s_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/3180/4574/files/chef_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/7173/3917/files/35112564349.pdf
    • https://cdn.shopify.com/s/files/1/0429/3161/7945/files/rivubemujibafufedoma.pdf
    • https://cdn.shopify.com/s/files/1/0432/3940/7784/files/mixefuzumasiguvawawodek.pdf
    • https://cdn.shopify.com/s/files/1/0432/8570/8968/files/xejeri.pdf
    • https://cdn.shopify.com/s/files/1/0429/4311/9527/files/fishery_and_aquaculture.pdf
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/kexavelumejex.pdf
    • https://cdn.shopify.com/s/files/1/0429/8981/3909/files/gibudinaberezaxalog.pdf
    • https://cdn.shopify.com/s/files/1/0429/8814/2743/files/jadirofom.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0743/files/35253821168.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062e1.bin
caeee1ec3f3d687332993a03385d6d3d51d69c1950ed1bfdde9ded5017488ad4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62E1 5152 bytes
font_01_sfnt_off00007478.bin
a33519475dac28c2c438dbf45efbebac1d11a581cdd8032b75daa8e845003580		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7478 9716 bytes
font_02_sfnt_off000095c9.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95C9 4324 bytes

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