Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a7e9ec95881bc0…

MALICIOUS

PDF

39.4 KB Created: 2020-08-18 22:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c0c8ef87f571723f10ce806f51dc93d SHA-1: 5df801309d0c20fda7657890ff7f132f4a68cd95 SHA-256: 83a7e9ec95881bc0bae3481ef3573abe549826989cda7df8dcfc8a4644e75e68
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure, and another critical heuristic for containing a mass external PDF link farm. The document body contains numerous URLs, including the malicious redirector and several other unknown URLs hosted on various domains. These findings suggest the document's primary purpose is to lure users to malicious sites, likely for further exploitation or malware delivery.

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.ru/pify?keyword=analyzing+evidence+continental+drift+worksheet+answer+key
    • http://powuxit.hhhschoirs.com/uploads/1/3/2/3/132303195/8245673.pdf
    • http://wepimopin.twobayhorses.com/uploads/1/3/1/3/131383657/86c1dd15641b9f1.pdf
    • http://tobowo.estherbelin.com/uploads/1/3/1/0/131070450/6741385.pdf
    • http://zugaso.thehuskyhowler.com/uploads/1/3/1/4/131437044/87e651d881.pdf
    • http://files.earthartbalance.com/uploads/1/3/1/4/131453329/nikabiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/9890/6528/files/dogumipalati.pdf
    • https://cdn.shopify.com/s/files/1/0435/1826/3448/files/linux_administration_handbook_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/thompson_performance_powerblast_plate_review.pdf
    • https://cdn.shopify.com/s/files/1/0433/3587/6776/files/wasanepupewewefelom.pdf
    • https://cdn.shopify.com/s/files/1/0437/2683/1784/files/ponejivabowimizeterona.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xiwisabimetabif.pdf
    • https://cdn.shopify.com/s/files/1/0432/7027/5237/files/50036186800.pdf
    • https://cdn.shopify.com/s/files/1/0437/9744/6816/files/85189182994.pdf
    • https://cdn.shopify.com/s/files/1/0432/2862/7107/files/curriculum_vitae_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/9606/3652/files/95056543287.pdf
    • https://cdn.shopify.com/s/files/1/0432/3088/8094/files/website_design_and_development_process.pdf
    • https://cdn.shopify.com/s/files/1/0437/6667/7655/files/87726262785.pdf
    • https://cdn.shopify.com/s/files/1/0439/9464/4638/files/bulls_on_parade_drum.pdf
    • https://cdn.shopify.com/s/files/1/0431/6420/5216/files/pdf_text_editor_freeware.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005995.bin
bb11a8368a2d5f1199282eed09284b0e6ccc6931f69e3558169cc05fced348ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5995 5640 bytes
font_01_sfnt_off00006cea.bin
5ac22aa3bd69452b14c9974763254e94c48235875205226597e2703c4553b6b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CEA 10580 bytes

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