Malicious PDF — malware analysis report

Static analysis result for SHA-256 084325dcdd93fe2c…

MALICIOUS

PDF

42.2 KB Created: 2020-08-09 09:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ada652669126c1020d2e0f6c4a11a014 SHA-1: 8775ccc7e18898ed130af4e7adcf3d269df503dc SHA-256: 084325dcdd93fe2cb4364e306bcf503555ca2f7ed6b765a23480d3658407590c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or potentially malicious domains. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed to drive traffic to external sites, likely for phishing or malware distribution. No scripts were extracted, but the primary attack vector appears to be the embedded links.

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=bel+ami+guy+de+maupassant+pdf+english
    • http://files.michellevanlare.com/uploads/1/3/1/4/131407901/42e69.pdf
    • http://files.economicslearningstandards.com/uploads/1/3/0/7/130775174/sagedete.pdf
    • http://sovemumo.jlrodgers.org/uploads/1/3/0/8/130814328/19a12f3.pdf
    • http://files.tuval-mashiach-psychology-biu.org/uploads/1/3/1/6/131607363/majirotegegulero.pdf
    • http://files.beadedtreats.com/uploads/1/3/1/3/131382243/bojufenisuda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0473/1300/files/5949012465.pdf
    • https://cdn.shopify.com/s/files/1/0429/7054/6329/files/byte_of_python_swaroop.pdf
    • https://cdn.shopify.com/s/files/1/0434/2936/3878/files/busbar_sizing_calculation.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/89045370956.pdf
    • https://cdn.shopify.com/s/files/1/0429/3237/1622/files/85723886219.pdf
    • https://cdn.shopify.com/s/files/1/0428/5821/7631/files/67970230310.pdf
    • https://cdn.shopify.com/s/files/1/0430/5597/2501/files/antigona_sofokles_kniha.pdf
    • https://cdn.shopify.com/s/files/1/0434/8005/5965/files/8186044679.pdf
    • https://cdn.shopify.com/s/files/1/0435/8127/6319/files/psychosocial_well_being_definition.pdf
    • https://cdn.shopify.com/s/files/1/0432/4396/2532/files/cpwd_specification.pdf
    • https://cdn.shopify.com/s/files/1/0436/9501/4042/files/57521758681.pdf
    • https://cdn.shopify.com/s/files/1/0430/8713/4882/files/39154678774.pdf
    • https://cdn.shopify.com/s/files/1/0448/0139/2801/files/mergers_acquisitions_and_corporate_restructurings_7th_edition.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_off00006607.bin
9a9b701595d589bd179d9bc119cc009ad0619cf96fc1f0ba81d7b990c4a61b8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6607 5512 bytes
font_01_sfnt_off000078b1.bin
efcc5a1334abc8713e4718368f5bf1593cf133d6992e50a90197e39276274192		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78B1 10344 bytes

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