Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8a19e615d8c0c6…

MALICIOUS

PDF

42.5 KB Created: 2020-08-09 02:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee2171a63213afc266a5196dda197728 SHA-1: 03ec2a80caba12f9851838321d589383268350be SHA-256: 1a8a19e615d8c0c6d8a77012ae048b7a07e4053798d7313f4e03f396611bd357
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded URLs, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document appears to be a link farm, likely intended to manipulate search engine results or distribute further malicious content through the numerous Shopify and other hosted PDF 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.cc/pify?keyword=fisiologia+de+absorcion+intestinal+pdf
    • http://files.eco-coatsolutions.com/uploads/1/3/1/4/131411542/7d266950e5b18d5.pdf
    • http://files.iamwestbrook.com/uploads/1/3/2/7/132712483/gunajetevi_suretul_badobi.pdf
    • http://joporufuj.scubadiveseychelles.com/uploads/1/3/1/4/131454012/2269048.pdf
    • http://digula.hgltours.com/uploads/1/3/1/0/131070161/madudeg.pdf
    • http://files.jasfinsecurity.com/uploads/1/3/0/8/130874683/819cb4f.pdf
    • https://cdn.shopify.com/s/files/1/0429/0324/0871/files/enlaces_quimicos_bachillerato.pdf
    • https://cdn.shopify.com/s/files/1/0432/0198/6723/files/loderojevimi.pdf
    • https://cdn.shopify.com/s/files/1/0435/8651/9195/files/nikesikinadujiw.pdf
    • https://cdn.shopify.com/s/files/1/0432/2436/7266/files/34754256237.pdf
    • https://cdn.shopify.com/s/files/1/0437/1732/9064/files/download_streaming_video.pdf
    • https://cdn.shopify.com/s/files/1/0428/5746/3964/files/ritisupi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5797/9304/files/51342618815.pdf
    • https://cdn.shopify.com/s/files/1/0433/3201/0152/files/catalogo_dahua_ip_2020.pdf
    • https://cdn.shopify.com/s/files/1/0438/3748/9309/files/swing_dress_pattern.pdf
    • https://cdn.shopify.com/s/files/1/0433/3636/8283/files/34809389187.pdf
    • https://cdn.shopify.com/s/files/1/0437/1664/0923/files/12122288293.pdf
    • https://cdn.shopify.com/s/files/1/0437/6294/2101/files/perimeter_and_area_worksheets_grade_6.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4267/files/jeriru.pdf
    • https://cdn.shopify.com/s/files/1/0431/4805/0583/files/joponisatixaxigivatasur.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_off00006894.bin
ce9e8e4a8adbebd4b78a975b5f3d32a1c7686185fc9b003b3d4add5063c4c8c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6894 5420 bytes
font_01_sfnt_off00007b08.bin
b9c354d68d73e4f35a9bf9ec2dcfe22513e6d2b42a9d77475576a04214ca79b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B08 9880 bytes

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