Malicious PDF — malware analysis report

Static analysis result for SHA-256 12040cb43fc8049d…

MALICIOUS

PDF

35.6 KB Created: 2020-09-20 11:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9ff2eb71f4f9e1adad92d1269fda43f SHA-1: a228a3976b2b79f641db764f89eef0261d69b635 SHA-256: 12040cb43fc8049da559abb43ef1170f0e11853c1b0db8c9c95c2a02c9bc283c
194 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a malicious SEO link farm, containing numerous links to other PDF files hosted on various domains. The primary link, 'https://ttraff.club/wix?keyword=download+apk+fb+lite+versi+lama', suggests a lure to download an application, likely malicious. The ML classifier strongly indicated maliciousness, and the presence of many external links points towards an attempt to distribute malware or engage in phishing. No scripts were extracted, but the structure and linked content are highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.club/wix?keyword=download+apk+fb+lite+versi+lama
    • http://files.beanieforpeace.com/uploads/1/3/1/8/131857117/ab31d4bef.pdf
    • http://wetonofiz.drdebkennedy.com/uploads/1/3/1/3/131380625/wajepazow.pdf
    • http://files.gaeltachtcommunications.com/uploads/1/3/1/3/131379999/wiselimugafupopatewe.pdf
    • http://vimemuta.cyndikuhn.info/uploads/1/3/0/8/130814088/fagavofokitoz_tepamerutelip.pdf
    • http://vitedim.abundantlivingpsychologicalandcoachingservices.com/uploads/1/3/1/3/131381761/7369036.pdf
    • http://lemaw.amygibbstherapies.com/uploads/1/3/2/6/132695584/bc5813cdc.pdf
    • http://xobawag.glessranchcurbside.com/uploads/1/3/1/6/131636725/4f46fbe24.pdf
    • http://files.njall.org/uploads/1/3/1/8/131856306/mider.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b8bb2de2-13f2-4688-8aee-1ddf2779aee4.filesusr.com/ugd/e66789_d06a0996beb64738a50b235196615780.pdf?index=true
    • https://1c5d7568-d69f-45af-84e4-00e545299088.filesusr.com/ugd/5f4192_c83987edf325453e82ab3b30aff2a0a8.pdf?index=true
    • https://450c1156-c80b-4207-aead-b70fb265e21d.filesusr.com/ugd/e33828_de0565915fcc4f81a4a7e72f921eb4a9.pdf?index=true
    • https://49de2d4e-7437-409e-95b1-d6282c1e81ce.filesusr.com/ugd/ed8107_cf125615c38547d2be6d8a0daf2b742c.pdf?index=true
    • https://c4a67d7e-13ef-4642-952e-fbe20ce452c2.filesusr.com/ugd/54dfea_ddc1cdbb71df4793a8e256f339588e98.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0434/3955/4727/files/jefedefaxadeleb.pdf
    • https://cdn.shopify.com/s/files/1/0436/5477/4949/files/pathfinder_ultimate_race_guide.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_off00004f3a.bin
98166fd23494b714dfabd968dadd8f9a3f119bd7184652002af7ff5ab5676456		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F3A 5544 bytes
font_01_sfnt_off00006219.bin
97ad330701ca60c33e37cc23fedddcddfc130aaf3514918a37ad6bca7fbd4b35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6219 9260 bytes

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