Malicious PDF — malware analysis report

Static analysis result for SHA-256 253101d9b3fc9af4…

MALICIOUS

PDF

97.1 KB Created: 2020-08-06 11:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bac7266fdd066d7a3f244254481476d0 SHA-1: b670d5dc269f22de3d4812676edc56c38bfab1fd SHA-256: 253101d9b3fc9af4106392066cfd4b4a8fc365239186ff9148029ae018716619
150 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 (ttraff.ru). This indicates a link farm or redirection attack designed to lead users to malicious content. The ML classifier also strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=abdus+salaam+chaus+marathi+english+dictionary+pdf In PDF document text
    • http://files.alliumresearch.com/uploads/1/3/1/6/131606118/7850207.pdfIn PDF document text
    • http://files.gardenesquetours.com/uploads/1/3/2/8/132814342/c3f64263dfe.pdfIn PDF document text
    • http://files.omhathayoga.com/uploads/1/3/2/6/132695401/bukigotafigune-dowojojutufavu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7758/0453/files/selection_sort_c.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6337/7048/files/1248226325.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4795/2292/files/ledumewadezasidulido.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7632/9373/files/84068851264.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2354/9094/files/felewenuriwuxexuvikelu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gipal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5341/4565/files/caesar_cipher_example.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8584/6933/files/coats_manual_tire_changer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7962/3071/files/95060633577.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/gitelinep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8774/9529/files/informal_business_report_sample.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7234/6526/files/90590592467.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0058/5632/files/bivigevebovanoguga.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011600.bin
e911bd0107b4dad44982af49638c4e33d7dd8ebdd6301b0a197dddbd8bd28588		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11600 5800 bytes
font_01_sfnt_off0001299c.bin
818eeee72c823f1d5db917445f3d7963df30d945fa915f3a137a3e72b48297c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1299C 16208 bytes
font_02_sfnt_off00015c45.bin
013dc3ad1a8c6d73b0fbc42650cfe084b8f596eea8600e09ea10fe368e63e5ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C45 16844 bytes

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