Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d03aa251173467…

MALICIOUS

PDF

38.5 KB Created: 2020-08-03 16:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 375d1cef8589b0e88cfae0859ce815f4 SHA-1: 6c201ba0c7f0f3ee90f9d6b273e263e45967402f SHA-256: 35d03aa251173467289bbfab882ea9ee228dfd8fe961d650620c29e9a48a79ef
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.cc/pify?keyword=tesis+de+administracion+de+empresas+pdf+chile, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to academic papers and the wkhtmltopdf tool, suggesting a lure to download or access content. The ML classifier strongly indicated maliciousness.

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=tesis+de+administracion+de+empresas+pdf+chile
    • http://files.msilaser.com/uploads/1/3/0/9/130969742/9305691.pdf
    • http://files.marielcosmeticsllc.com/uploads/1/3/0/7/130740256/565b076ce0e.pdf
    • http://files.maevemovement.com/uploads/1/3/2/7/132712483/1489642.pdf
    • http://kedet.shannoncooney.site/uploads/1/3/1/4/131437246/megelabimapixaz-piwijiber.pdf
    • https://cdn.shopify.com/s/files/1/0433/5799/5160/files/wezutodutuwi.pdf
    • https://cdn.shopify.com/s/files/1/0435/8343/9003/files/lefajikizosonedaxiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/0496/0661/files/33512490110.pdf
    • https://cdn.shopify.com/s/files/1/0440/1584/5541/files/3641947167.pdf
    • https://cdn.shopify.com/s/files/1/0436/6372/0613/files/17372972369.pdf
    • https://cdn.shopify.com/s/files/1/0431/5889/6802/files/stardew_valley_crop_layout.pdf
    • https://cdn.shopify.com/s/files/1/0432/2862/7107/files/5697625970.pdf
    • https://cdn.shopify.com/s/files/1/0430/6341/0845/files/red_sox_schedule_2017.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70354855800.pdf
    • https://cdn.shopify.com/s/files/1/0431/4287/3249/files/buwutonaziditozi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21086069096.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/zeraxodugilanolin.pdf
    • https://cdn.shopify.com/s/files/1/0432/7260/1756/files/koruvuruxuzakajodimilam.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_off0000565e.bin
e322de0cd70ebe97781dc0ef17290b8f1c6ba1fb54d4ea5ca9fd2484ebcd8236		 pdf-font-stream PDF embedded font (sfnt) at offset 0x565E 5344 bytes
font_01_sfnt_off0000685d.bin
fa163853dcd594e0a87dfd9c050ded047549b07925b061079f9d2f3a4c7d059d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x685D 10668 bytes

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