Malicious PDF — malware analysis report

Static analysis result for SHA-256 79fc504d5a2709a6…

MALICIOUS

PDF

56.6 KB Created: 2020-10-23 20:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7e695d6d399c757a7d7625862ac1c30 SHA-1: 183499567d7f58aeee803bf54c82ec25eb79cdc5 SHA-256: 79fc504d5a2709a67df7476b7a4734a7c313961ea78960bda72d6d94d58a49e8
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector, suggesting an attempt to drive traffic to malicious sites or engage in SEO spam. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings point towards a malicious redirection or link farm attack pattern.

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/123?keyword=induction+cooker+circuit+diagram+pdf
    • https://cdn-cms.f-static.net/uploads/4368978/normal_5f8a4ecabb283.pdf
    • https://cdn-cms.f-static.net/uploads/4385216/normal_5f92a4cdc943b.pdf
    • https://cdn-cms.f-static.net/uploads/4379839/normal_5f928cf127e28.pdf
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f8764a84a3e7.pdf
    • https://xutewosabog.weebly.com/uploads/1/3/2/3/132303209/kugotaka.pdf
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/101086.pdf
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/8117365.pdf
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/zesegidewu.pdf
    • https://cdn-cms.f-static.net/uploads/4386606/normal_5f90d862f2b35.pdf
    • https://cdn-cms.f-static.net/uploads/4375080/normal_5f91002b6ab8a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0502/9638/9828/files/68156476025.pdf
    • https://cdn.shopify.com/s/files/1/0440/6332/6358/files/86100905778.pdf
    • https://cdn.shopify.com/s/files/1/0486/6424/8470/files/26737579491.pdf
    • https://cdn.shopify.com/s/files/1/0433/4105/4105/files/tank_trouble_unblocked_88.pdf
    • https://cdn.shopify.com/s/files/1/0437/6035/3429/files/evil_eye_plus_apk.pdf
    • https://cdn.shopify.com/s/files/1/0478/8437/0086/files/57775443109.pdf
    • https://cdn.shopify.com/s/files/1/0501/0784/2725/files/download_contoh_daftar_riwayat_hidup.pdf
    • https://cdn.shopify.com/s/files/1/0502/1827/0905/files/hud_cash_out_refinance_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0499/3266/4990/files/74637256622.pdf
    • https://cdn.shopify.com/s/files/1/0431/6001/0912/files/az-103_study_guide.pdf
    • https://s3.amazonaws.com/xanebavifamopez/zeputefigomeborokuliz.pdf
    • https://s3.amazonaws.com/fasanag/teresixonibinimo.pdf
    • https://s3.amazonaws.com/wizedumi/air_fryer_recipes.pdf
    • https://s3.amazonaws.com/mibiwivanetuj/les_neurones_cours.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_off00009a0d.bin
fee5a95ccda35b8db1731afea989dde8dd42d36937ebcf341db8b809ad44dfde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A0D 5264 bytes
font_01_sfnt_off0000abea.bin
4b69855a39f4ca560877f2d5096f73b3ae1dcf2a76b71baa4f40c9e6fb5feace		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABEA 11324 bytes

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