Malicious PDF — malware analysis report

Static analysis result for SHA-256 1122b783221fa9b2…

MALICIOUS

PDF

42.3 KB Created: 2020-08-12 04:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76373fced24b70f6c3a07fe1c8387a35 SHA-1: 2370c6b2579edff32658d0c008e97c616f73597d SHA-256: 1122b783221fa9b2c43d0c36bf4532716f0335034948569c2491faf3f571adf6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body and embedded links suggest a lure to download further malicious content, likely disguised as worksheets or other files. The ML classifier strongly indicates malicious intent.

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.com/pify?keyword=6th+grade+fun+worksheets+pdf
    • http://files.necropheliaclothing.com/uploads/1/3/2/6/132682819/sopifitepera-zasosonajo-xajaziz.pdf
    • http://files.eaglesunifiedbooster.com/uploads/1/3/0/7/130740257/gifoligedafus.pdf
    • http://jewoput.simplycakesmiami.com/uploads/1/3/1/4/131437987/nasetetopigegi_lewewanenopisaj_baxaxi_letokesav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/2317/0710/files/5e_criminal_background.pdf
    • https://cdn.shopify.com/s/files/1/0429/0668/1497/files/34889659182.pdf
    • https://cdn.shopify.com/s/files/1/0431/2412/9953/files/libro_biopsicologia_john_pinel.pdf
    • https://cdn.shopify.com/s/files/1/0432/6332/8418/files/tozajenijibaseni.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/craigslist_org_kalamazoo.pdf
    • https://cdn.shopify.com/s/files/1/0429/3859/7539/files/1641109132.pdf
    • https://cdn.shopify.com/s/files/1/0431/4847/6572/files/blitzkrieg_bop_chords.pdf
    • https://cdn.shopify.com/s/files/1/0437/8158/7095/files/97835011374.pdf
    • https://cdn.shopify.com/s/files/1/0431/7406/8390/files/56332461736.pdf
    • https://cdn.shopify.com/s/files/1/0428/2508/9191/files/66960168847.pdf
    • https://cdn.shopify.com/s/files/1/0433/7382/2102/files/transistorized_ignition_system.pdf
    • https://cdn.shopify.com/s/files/1/0433/4980/3166/files/fakukatiwuti.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000592e.bin
efc7fc492963ccc177211ae31789ce1c69d54919445218ddc6679785f9372aae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x592E 5320 bytes
font_01_sfnt_off00006b49.bin
49829eec57366a0965703563b30fa4fe57abfb3c9d0b5c51f5b8a4e75cede6c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B49 10140 bytes
font_02_sfnt_off00008dfb.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DFB 4324 bytes

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