Malicious PDF — malware analysis report

Static analysis result for SHA-256 048551b6571db39f…

MALICIOUS

PDF

39.9 KB Created: 2020-07-15 16:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b43162b7828912a7277bb4937cb9c6af SHA-1: fcb772e15cd70fdb72b750d73a9de4f672a4704d SHA-256: 048551b6571db39f192fdd51beb0c46e2528698b3ede292eb280aebf0d8851db
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, disguised as an Audi A3 user manual. It also hosts a large number of other PDF files, suggesting a link farm intended to manipulate search engine results for malicious purposes. The ML classifier strongly indicated maliciousness.

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/wb?keyword=audi%20a3%202017%20user%20manual
    • http://files.fauxmesticgoddess.com/uploads/1/3/1/8/131856381/gevaxil.pdf
    • http://files.ckumaresan.com/uploads/1/3/0/7/130739343/f25f408c3e74.pdf
    • http://files.geeveemeyer.com/uploads/1/3/0/9/130969431/2438.pdf
    • http://files.conjunctionmedia.com/uploads/1/3/1/4/131409761/8780520.pdf
    • http://files.vmartfilipinostore.com/uploads/1/3/1/3/131381553/totebom_wumizeduzel.pdf
    • http://files.arippleeffect.ca/uploads/1/3/1/3/131380546/79e8d0.pdf
    • http://files.wisewomanliving.net/uploads/1/3/1/4/131453623/625741.pdf
    • http://files.crafterafterhours.com/uploads/1/3/1/1/131164002/kadirorepaji.pdf
    • http://files.5oclocktravelandcruise.com/uploads/1/3/0/9/130969260/ridinodupunorutufije.pdf
    • http://files.thenewschoolpreschool.com/uploads/1/3/0/7/130739452/satevepumebu-garovuretetafok-bonazet-gimoxe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://nonepagok.files.wordpress.com/2020/07/78547367304.pdf
    • https://surefab.files.wordpress.com/2020/07/zapebogilugadunaragusabe.pdf
    • https://desowodor.files.wordpress.com/2020/07/24529310100.pdf
    • https://xomabife.files.wordpress.com/2020/07/64110006738.pdf
    • https://nizulaxowamo181495606.files.wordpress.com/2020/07/50943974305.pdf
    • https://cdn.shopify.com/s/files/1/0430/5174/5442/files/vujagopevixu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3973/6487/files/vusemugaxamexibevobutox.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3353/files/gilelut.pdf
    • https://cdn.shopify.com/s/files/1/0432/2898/7547/files/52124624252.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kixekitigatozodevejale.pdf
    • https://cdn.shopify.com/s/files/1/0431/5162/2306/files/dukaxal.pdf
    • https://cdn.shopify.com/s/files/1/0429/7372/4825/files/sivogopekixup.pdf
    • https://cdn.shopify.com/s/files/1/0434/1340/5850/files/xiluluzipariseladaf.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_off00005f79.bin
3af0bf619d464b8df24a63204c6f9cea3f3d77b79b5dab0952f01b6493618cc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F79 5224 bytes
font_01_sfnt_off0000710d.bin
385f2a675b73141d4a9373cd6ee561cfe300ab66c9047d7ee3be1e5baca9605b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x710D 9684 bytes

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