Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8c169a8b483736…

MALICIOUS

PDF

39.6 KB Created: 2020-08-23 02:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d91d5144a54049ed10cf84f43938a6e2 SHA-1: fce4e8b2fcdfc589ef499700425bdda7b4d4a5ab SHA-256: 7f8c169a8b483736b4d2ac761c2e90434033a7980966a511b032673c9d17936b
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to benign Shopify domains, but one critical link to a known malicious redirector. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' indicates the document's content is designed to trick users into a fraudulent scheme involving prizes or funds and courier delivery. The presence of a malicious redirector suggests an attempt to lead the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.ru/pify?keyword=affidavit+of+scrivener%2527+s+error+form+florida
    • http://files.epicrop.com/uploads/1/3/2/6/132681647/xazomuzaxep_jigovugewuja_xepipe_jegaxazab.pdf
    • http://files.classicshedsandgazebos.com/uploads/1/3/0/8/130874046/306039.pdf
    • http://files.unitedkingdomvintage.com/uploads/1/3/0/7/130740517/kegizojikobiti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/2470/9782/files/png_photo_background_image.pdf
    • https://cdn.shopify.com/s/files/1/0431/8927/2725/files/72929285726.pdf
    • https://cdn.shopify.com/s/files/1/0430/8860/9429/files/69913490452.pdf
    • https://cdn.shopify.com/s/files/1/0433/0638/5558/files/mowezokarukomoje.pdf
    • https://cdn.shopify.com/s/files/1/0438/4686/0960/files/8678868398.pdf
    • https://cdn.shopify.com/s/files/1/0434/5554/5497/files/46836386337.pdf
    • https://cdn.shopify.com/s/files/1/0431/9451/5614/files/talimujefudujovejotob.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kefemomorevogik.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/76304343395.pdf
    • https://cdn.shopify.com/s/files/1/0427/6381/3020/files/nivajatumiberumi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/womonevixaxijebuvi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4601/8967/files/eastern_guilford_middle_school_report_card.pdf
    • https://cdn.shopify.com/s/files/1/0438/3680/1181/files/14777965364.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_off00005c7f.bin
4de10f0bc5cc8bba650f6fac56d4f990963a35b83b263ac91b4b93338cffccab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C7F 5252 bytes
font_01_sfnt_off00006e49.bin
07934739a343ccacd4ffd630f3d7d9a4b327e832bd03f05921a49416142a1e2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E49 10212 bytes

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