Malicious PDF — malware analysis report

Static analysis result for SHA-256 013cfbc103ccea32…

MALICIOUS

PDF

55.2 KB Created: 2020-08-08 20:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 920b8a42bd35a4ae3bbac8be294a4452 SHA-1: 4b9b9dc5668f33af19d369c09763fa796a3708f7 SHA-256: 013cfbc103ccea32fc46d9c1ca368879a131146378f3f23c4817abc70c8d502a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.cc/pify?keyword=az+cardinals+schedule+2020+pdf`. The document body also contains this URL and numerous other links to PDF files hosted on Shopify and other domains, indicating a link farm strategy. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to click a malicious link disguised as a legitimate document.

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=az+cardinals+schedule+2020+pdf
    • http://files.directoverheaddoors.com/uploads/1/3/1/8/131856188/4dbde744636.pdf
    • http://zabijuti.quiddityphotography.com/uploads/1/3/2/7/132710712/wurazuzetuwisi-nusobubifab-kugotezoxuku.pdf
    • http://files.carnegieartcornerstones.com/uploads/1/3/1/0/131070576/jafixusixi-sudilitotuxox-kovegatuteg-mewezoxowoxa.pdf
    • http://pexovuw.weddingproct.com/uploads/1/3/0/9/130969352/gafuxoxun_bovopake_ludopepiriza_rekiko.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/1143/1838/files/zepimi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tugerivedisabuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/zazokufidozij.pdf
    • https://cdn.shopify.com/s/files/1/0430/8857/6661/files/painter_essentials_5.pdf
    • https://cdn.shopify.com/s/files/1/0444/3871/6583/files/agenda_setting_and_problem_definition.pdf
    • https://cdn.shopify.com/s/files/1/0432/9019/8180/files/wonky_donkey_story.pdf
    • https://cdn.shopify.com/s/files/1/0435/2675/0357/files/biology_sylvia_mader_11th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/8721/6293/files/67518524192.pdf
    • https://cdn.shopify.com/s/files/1/0450/6445/4294/files/azure_information_protection_step_by_step.pdf
    • https://cdn.shopify.com/s/files/1/0437/7663/9134/files/tululozeganil.pdf
    • https://cdn.shopify.com/s/files/1/0431/5319/5162/files/popigekigapegolam.pdf
    • https://cdn.shopify.com/s/files/1/0431/6640/0663/files/16945513991.pdf
    • https://cdn.shopify.com/s/files/1/0451/5794/1402/files/abby_pollock_workout_plan.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_off000099b0.bin
09cfe90eb7f8ed0dae7dda014d0c3b3874d66b6aaf88c06374160f1274d3ffd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99B0 5556 bytes
font_01_sfnt_off0000ac98.bin
ba1e45d486ef8e40381d20afb52af0ee5dbbe0b866e79b87ed129e412f6658f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC98 10364 bytes

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