Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f97cb777029a86…

MALICIOUS

PDF

46.7 KB Created: 2020-08-01 13:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16de50c4c7902b43a990151d238804da SHA-1: 7128f15f3bdfb43d03eccf77320b0a3888877274 SHA-256: e3f97cb777029a861f48f5433f360c375eeca8b53ec3550b5058939255f5897b
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 pointing to Shopify domains, but one critical link redirects to a known malicious infrastructure at 'ttraff.cc'. This suggests a link farm or SEO poisoning technique used to distribute malicious content. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be social engineering via a lure for a PDF download, leading to a malicious redirector.

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=catholicism+for+dummies+pdf
    • http://files.grayboxprojects.com/uploads/1/3/0/9/130969817/memevubukaboleteluza.pdf
    • http://files.crosstekco.com/uploads/1/3/1/3/131378838/6156966.pdf
    • http://files.katemcelroy.com/uploads/1/3/1/8/131871568/3252074.pdf
    • https://cdn.shopify.com/s/files/1/0432/5667/6510/files/xisarul.pdf
    • https://cdn.shopify.com/s/files/1/0430/7809/0901/files/hp_laserjet_3050_driver.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/jajodopatedugapuzabozis.pdf
    • https://cdn.shopify.com/s/files/1/0435/1174/2628/files/lusidiseg.pdf
    • https://cdn.shopify.com/s/files/1/0431/4041/5644/files/jegokuxeki.pdf
    • https://cdn.shopify.com/s/files/1/0430/6698/2561/files/melakusoni.pdf
    • https://cdn.shopify.com/s/files/1/0433/0638/5573/files/45974247971.pdf
    • https://cdn.shopify.com/s/files/1/0437/4138/0762/files/91821377759.pdf
    • https://cdn.shopify.com/s/files/1/0434/3146/1016/files/57350745643.pdf
    • https://cdn.shopify.com/s/files/1/0431/5165/5076/files/wojanejoso.pdf
    • https://cdn.shopify.com/s/files/1/0437/6264/7189/files/80868748617.pdf
    • https://cdn.shopify.com/s/files/1/0431/6695/7722/files/rekoviwijaxekopisebafus.pdf
    • https://cdn.shopify.com/s/files/1/0434/8392/2585/files/lepibenajafawuze.pdf
    • https://cdn.shopify.com/s/files/1/0433/3279/6574/files/blogspot_books.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006906.bin
572c374e69c6c05740b9c50d3a013b954d76e590677a3fd02ee924e4f457e832		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6906 5196 bytes
font_01_sfnt_off00007ab1.bin
570a31f1833dd204aba70d38c563ba385ae3d1e74b5ea6b222e0a13e5f8203a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB1 10388 bytes
font_02_sfnt_off00009e1f.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E1F 4324 bytes

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