Malicious PDF — malware analysis report

Static analysis result for SHA-256 044e10213eed1f2c…

MALICIOUS

PDF

42.2 KB Created: 2020-08-12 17:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 067b1ecca07fec9d016ab3d7b87bd39d SHA-1: 5b7ed5fed4794fd7cae5e9cb25ef1f083ce257ec SHA-256: 044e10213eed1f2c954a6cf73a22df5a79f811b5ac46106e5bfcd9761362fb7c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to academic topics and URLs, suggesting a lure to a malicious site. The ML classifier also 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.com/pify?keyword=project+topics+for+mathematics+undergraduates+pdf
    • http://xemewaz.limanawic.com/uploads/1/3/0/7/130740178/4604411.pdf
    • http://kuzob.empiricfashion.com/uploads/1/3/0/7/130775971/4813972.pdf
    • http://files.workingwordsproductions.com/uploads/1/3/0/7/130740368/dofobeturo.pdf
    • http://mewisame.romancewaiheke.co.nz/uploads/1/3/1/8/131871991/66b623e8e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/4986/1791/files/10163199424.pdf
    • https://cdn.shopify.com/s/files/1/0431/0558/3266/files/genararewopososakeres.pdf
    • https://cdn.shopify.com/s/files/1/0435/6997/1363/files/classification_algorithms.pdf
    • https://cdn.shopify.com/s/files/1/0428/5035/3318/files/42004276812.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/28603075132.pdf
    • https://cdn.shopify.com/s/files/1/0438/1566/5826/files/how_to_use_getline_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0428/5674/3079/files/96805323373.pdf
    • https://cdn.shopify.com/s/files/1/0428/3033/2060/files/super_calloused_fragile_mystic_hexed_by_halitosis.pdf
    • https://cdn.shopify.com/s/files/1/0434/2992/0930/files/affiliate_marketing_definition.pdf
    • https://cdn.shopify.com/s/files/1/0434/7353/5142/files/45053197931.pdf
    • https://cdn.shopify.com/s/files/1/0430/1760/1181/files/44497375202.pdf
    • https://cdn.shopify.com/s/files/1/0435/9212/2527/files/44674374587.pdf
    • https://cdn.shopify.com/s/files/1/0433/3040/4502/files/13524024285.pdf
    • https://cdn.shopify.com/s/files/1/0430/1740/4573/files/3536419804.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_off00006602.bin
50474575391399134b0f40968a910b2f807a43bb3fb6390c76a36cf30913ce76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6602 5612 bytes
font_01_sfnt_off000078f8.bin
47d8ae72d313f596aee961da522b744498a4cd13e6aed479a940a1432c5a28a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78F8 10128 bytes

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