Malicious PDF — malware analysis report

Static analysis result for SHA-256 14cb48ca28ee654d…

MALICIOUS

PDF

43.9 KB Created: 2020-09-17 06:41:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e4f08ac791fc1c21ec9a8b1c71f5edc SHA-1: a455dff5a0c806eb5be94466ec78d3815117b730 SHA-256: 14cb48ca28ee654d61fa026119fe6684f6c9023c4f076687ab44b61507344aaf
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. Additionally, it features a large number of external PDF links, suggesting a link farm for SEO manipulation or traffic redirection. The ML classifier also strongly indicated maliciousness. The primary IOC is the redirector URL, which is likely used to host or distribute further 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.me/wix?keyword=csr+apk+2
    • http://files.thebuskersproject.com/uploads/1/3/0/7/130740213/1407879.pdf
    • http://files.corallinesplaytime.com/uploads/1/3/1/0/131070476/511d040c8cb.pdf
    • http://files.ddrainbow.com/uploads/1/3/2/6/132682124/9023088.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0440/4989/1478/files/rasikumixunowabezu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2717/7380/files/boulevard_of_broken_dreams_video_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/6393/5129/files/5970149061.pdf
    • https://cdn.shopify.com/s/files/1/0463/0292/0864/files/watch_dogs_2_cross_platform_co_op.pdf
    • https://cdn.shopify.com/s/files/1/0432/8855/9780/files/27356291821.pdf
    • https://cdn.shopify.com/s/files/1/0439/7318/1598/files/penyebaran_agama_kristen_di_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0463/4581/4173/files/bhikari_film_songs.pdf
    • https://81d4e0d0-edfb-4e0e-a950-0d4935eb568e.filesusr.com/ugd/a98ecc_c247ac86844d44748513be76b1532d3f.pdf?index=true
    • https://c2d713f4-cf91-40be-a4cf-99d041e2f52f.filesusr.com/ugd/dcfb95_ca1250615350458eb8b823fdfafdc564.pdf?index=true
    • https://1e2ca0bb-4b47-4bc2-941d-a115fea2a7a9.filesusr.com/ugd/fc840b_6334ed0683cd4ddcb343565addafed86.pdf?index=true
    • https://5073ecb5-de6b-4da6-93c3-bef75053cb73.filesusr.com/ugd/c1de29_a428be5fbb5b4f4d8bb66195fe971114.pdf?index=true
    • https://6dd6f175-fa88-416a-80b1-77a6234e192c.filesusr.com/ugd/a98ecc_763e0933166f462699edb237198dc8ae.pdf?index=true
    • 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_off000061cc.bin
f5752534faee37cc4947fe0d7cf4353b3b246f904096adfbc4f7987b11075d5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61CC 4324 bytes
font_01_sfnt_off00007076.bin
96acbbcdd805131142bce17653cd5cba4c4faa68f59d59475fcb2f3495883e53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7076 10660 bytes
font_02_sfnt_off00009505.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9505 4324 bytes

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