Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcdd70d19526e994…

MALICIOUS

PDF

43.4 KB Created: 2020-08-22 09:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de487597b88521bf5ee4750ed7fa5547 SHA-1: 3165f4020ad05be6c0b799c872469440b9b5a25d SHA-256: dcdd70d19526e994c5ddc01c3515a2c2acdbdeff1b79666c3c14b847e2e0e582
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm and a direct link to a known malicious redirector, suggesting a phishing or scam attempt. The document body presents a worksheet title, likely as a lure. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the presence of numerous embedded URLs points to a delivery mechanism for 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.cc/pify?keyword=identify+the+adjective+in+the+sentence+worksheet
    • http://xuralo.38plus2productions.com/uploads/1/3/1/3/131398177/nejuwisugobad.pdf
    • http://files.moabgearheads.com/uploads/1/3/1/4/131483184/reboxumam-pabifeletos-navalolojamob-tamimok.pdf
    • http://files.kdgdistribution.com/uploads/1/3/2/6/132682936/9713459.pdf
    • http://files.nayaung.net/uploads/1/3/0/7/130775859/6038679.pdf
    • http://files.dioperez.com/uploads/1/3/1/6/131607522/6886621.pdf
    • https://cdn.shopify.com/s/files/1/0429/9010/8833/files/watumifepedifamigix.pdf
    • https://cdn.shopify.com/s/files/1/0430/6599/9511/files/53976324135.pdf
    • https://cdn.shopify.com/s/files/1/0435/6017/3717/files/capricorn_man_secrets_anna_kovach.pdf
    • https://cdn.shopify.com/s/files/1/0430/5371/1513/files/addison_disease_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/9019/8180/files/games_button_vector_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/6658/0382/files/76810828352.pdf
    • https://cdn.shopify.com/s/files/1/0430/3280/5527/files/powediruvaruxopikud.pdf
    • https://cdn.shopify.com/s/files/1/0430/9801/3845/files/embroidery_stitch.pdf
    • https://cdn.shopify.com/s/files/1/0430/4614/2114/files/norma_de_cirugia_ambulatoria.pdf
    • https://cdn.shopify.com/s/files/1/0430/9372/1255/files/37226914005.pdf
    • https://cdn.shopify.com/s/files/1/0432/4638/7362/files/monster_hunter_world_discord.pdf
    • https://cdn.shopify.com/s/files/1/0434/5466/0758/files/34061252513.pdf
    • https://cdn.shopify.com/s/files/1/0434/4496/1442/files/present_perfect_tense_with_already_and_yet.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_off00005f1d.bin
62553a4460c03f0a48a3dde6a2a17d8f498284dbe27c3905d773975400fd81df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F1D 5196 bytes
font_01_sfnt_off000070d6.bin
0bcee1bb75ea38afdf98cc4055b84e476eea98432fa970d769e6e5256da249a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70D6 9792 bytes
font_02_sfnt_off00009233.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9233 4324 bytes

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