Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ddf64cdff1dd0e…

MALICIOUS

PDF

36.6 KB Created: 2020-08-22 00:38:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f238649d8f9b7ff6cceadfe317160d57 SHA-1: a8dd9efdddee1fade207d010e37f37c31d9a00a1 SHA-256: 53ddf64cdff1dd0e8eb0da704ce29a189db37a14419946100c499924ebf18b5e
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that points to a known malicious redirector, likely serving as a lure for further malicious activity. The presence of numerous external PDF links, many hosted on Shopify, suggests a tactic to obscure the ultimate destination or to leverage legitimate platforms for distribution.

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=wordscapes+answers+1042
    • http://files.shortbeachdays.com/uploads/1/3/1/4/131437619/9145093.pdf
    • http://files.mrhansondai.com/uploads/1/3/0/7/130738738/varifup-givomosek-domomubij.pdf
    • http://gerula.pollinatorsnativeplants.com/uploads/1/3/1/6/131606262/e4f220ec97.pdf
    • https://cdn.shopify.com/s/files/1/0430/8297/3345/files/clear_serial_monitor_arduino.pdf
    • https://cdn.shopify.com/s/files/1/0433/3905/5253/files/gobepetugejos.pdf
    • https://cdn.shopify.com/s/files/1/0430/1540/5725/files/fundamentals_of_integral_calculus.pdf
    • https://cdn.shopify.com/s/files/1/0434/8638/0197/files/resume_file_download_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/0267/4845/files/fizoliwetamilosupojowide.pdf
    • http://dewagu.artspacerva.square.site/uploads/1/3/0/7/130738921/welowef-pasigiwefidexi-mesabo-ritifenuta.pdf
    • https://cdn.shopify.com/s/files/1/0431/7220/0608/files/92218986628.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46287179129.pdf
    • https://cdn.shopify.com/s/files/1/0461/7338/8953/files/felicity_ward_mash_report.pdf
    • https://cdn.shopify.com/s/files/1/0432/2253/2251/files/kusenisudoxumazakuma.pdf
    • https://cdn.shopify.com/s/files/1/0427/6381/3020/files/multivariable_calculus.pdf
    • https://cdn.shopify.com/s/files/1/0431/8062/1984/files/bed_sheets_set_of_4.pdf
    • https://cdn.shopify.com/s/files/1/0435/6666/1791/files/93086764362.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_off0000509f.bin
031b50753e906426e550644f93cf70b30054aa758e4efd94ae7d5d499686c990		 pdf-font-stream PDF embedded font (sfnt) at offset 0x509F 5552 bytes
font_01_sfnt_off000063bc.bin
b81db27ce867b1bf325ce7cb5f8763907807cc05a74528fc26afb9207ef6b055		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63BC 9972 bytes

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