Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0bd346cd919be15…

MALICIOUS

PDF

32.7 KB Created: 2020-08-04 09:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce5ec9a0367f81a3a719310248ec9225 SHA-1: 269f3aaa4a2da8528aea317f5591453621adc31a SHA-256: f0bd346cd919be15599b901165c63b0f6bc1a5251fb47f490301d6888382c417
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to a redirector service known to host malicious content. The document body, though partially corrupted, includes text suggesting a lure related to 'Ayurveda books pdf in bengali', aiming to entice users to click these links. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector attack.

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=ayurveda+books+pdf+in+bengali
    • http://files.sleukrithmotionpicture.com/uploads/1/3/1/4/131437194/dukijosudep_jadirojofot.pdf
    • http://files.conspiritu.org/uploads/1/3/0/8/130813888/c87404f8fc26a03.pdf
    • http://files.gargiulocaterers.com/uploads/1/3/0/8/130813317/tavujaxevux.pdf
    • https://cdn.shopify.com/s/files/1/0437/3181/2504/files/47515596038.pdf
    • https://cdn.shopify.com/s/files/1/0430/1747/0101/files/tuesday_with_morrie_summary.pdf
    • https://cdn.shopify.com/s/files/1/0432/0270/7616/files/jupoxulufepapufoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/6916/9045/files/nifawudiwatarunokob.pdf
    • https://cdn.shopify.com/s/files/1/0428/4124/3814/files/nimarazasifi.pdf
    • https://cdn.shopify.com/s/files/1/0435/1783/7480/files/84912344192.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6586/files/81982251066.pdf
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/14726301601.pdf
    • https://cdn.shopify.com/s/files/1/0434/1697/7559/files/dekumun.pdf
    • https://cdn.shopify.com/s/files/1/0430/4653/5322/files/47068134572.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_off00004288.bin
4a9f5336e5eb75799e0c6a3c6c15165d8e22fa2397b79b100ca7a1fe11ade35c
pdf-font-stream PDF embedded font (sfnt) at offset 0x4288 5564 bytes
font_01_sfnt_off0000559a.bin
78a7d3e8fd08914c868f30465fd8255d10382a8f40f8b7725b35437554642b37
pdf-font-stream PDF embedded font (sfnt) at offset 0x559A 9620 bytes