Malicious PDF — malware analysis report

Static analysis result for SHA-256 1188a1b8090ace7f…

MALICIOUS

PDF

40.6 KB Created: 2020-09-03 21:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f65d398fbf143eac0aff8abe1e625d6 SHA-1: fb748fb908eda4ed48e78aac5d0186eb7e35412b SHA-256: 1188a1b8090ace7f7acc0da028933fe3402bb57729cbfc98fa02b640426bf8b1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a redirector disguised as a job description, which is a common lure for phishing or malware delivery. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the malicious nature of the link. The PDF also contains a large number of external links, suggesting it is part of a link farm designed to manipulate search engine results.

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.club/wix?keyword=dialysis+nurse+job+description+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_89d5308107374ac8927f28b604a1b444.pdf
    • https://static.usrfiles.com/ugd/ac51ce_3626d32c8bfa4cd78dd85610662c054c.pdf
    • https://static.usrfiles.com/ugd/52b593_baf47bf04048446cac2842ed29f7d39c.pdf
    • https://static.usrfiles.com/ugd/b42fd6_97126eb512724fa498a6f937b0eff376.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f354766dc8c496ab16c26d508c0557a.pdf
    • https://static.usrfiles.com/ugd/3402b1_b4b55967ea344d2383714b8cde5b26f2.pdf
    • https://static.usrfiles.com/ugd/c34aa9_defc9056af0b4b3ea2fc4a133e2de07b.pdf
    • https://static.usrfiles.com/ugd/b8c837_277be9e0bb5047dc8b8d9105d319aac5.pdf
    • https://static.usrfiles.com/ugd/b8c837_c24c944a9cb046c1acfeb53a213222cb.pdf
    • https://static.usrfiles.com/ugd/b8c837_f869c9e6f1204f20bb41cb2ded25ac0e.pdf
    • https://cdn.shopify.com/s/files/1/0436/4114/3454/files/jadujada.pdf
    • https://cdn.shopify.com/s/files/1/0430/8900/2645/files/fur_elise_sheet_music_flute.pdf
    • https://cdn.shopify.com/s/files/1/0438/4574/6838/files/nukuwivo.pdf
    • https://cdn.shopify.com/s/files/1/0427/9838/3260/files/bamazupadasagofapubo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0813/0197/files/derazorewetetesurobatafux.pdf
    • https://cdn.shopify.com/s/files/1/0447/3529/9738/files/1001_arabian_nights_geraldine_mccaughrean.pdf
    • https://cdn.shopify.com/s/files/1/0431/6469/6732/files/angular_template_and_template_url.pdf
    • https://cdn.shopify.com/s/files/1/0433/3459/8809/files/36531699349.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_off00005381.bin
19b7ae450368bf14da172d2bfee1a6ce3b40661670ca6bae409828112e5d850d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5381 5348 bytes
font_01_sfnt_off000065bc.bin
d0b99871cba22ea684dbe270e3391f8af0dd0fb8768155798d5a8a255292c4a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65BC 9764 bytes
font_02_sfnt_off0000870d.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x870D 4324 bytes

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