Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f218faac70a83a…

MALICIOUS

PDF

36.4 KB Created: 2020-08-03 12:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1415fa47dd6efe83a06ed5ee3529bb6f SHA-1: 0f20dc12192eee138f1e60b8aa1fc7f6fd09a08e SHA-256: f1f218faac70a83a5ddd742e08faa6c69e3e2f45bbfcf92ce4fddd868788106d
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body text, though garbled, includes the search query 'biophysical chemistry by upadhyay and nath pdf download', suggesting a lure to trick users into downloading a malicious file disguised as an academic PDF. The primary malicious IOC is the redirector URL, which likely serves as the initial stage for delivering a secondary payload.

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.ru/pify?keyword=biophysical+chemistry+by+upadhyay+and+nath+pdf+download
    • http://files.hillviewchristian.org/uploads/1/3/2/6/132682210/xofovagez_vadeluboxovo_modimet.pdf
    • http://files.lissawozniakphotography.com/uploads/1/3/1/0/131070230/7a0c3386a.pdf
    • http://files.djjbish.com/uploads/1/3/2/6/132681674/3096896.pdf
    • http://files.attilatanyi.com/uploads/1/3/2/6/132681647/8387c16.pdf
    • https://cdn.shopify.com/s/files/1/0435/5181/7879/files/vamebedefibexizifuvewuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/9033/7174/files/20519033662.pdf
    • https://cdn.shopify.com/s/files/1/0431/3051/9716/files/titiwiniwe.pdf
    • https://cdn.shopify.com/s/files/1/0434/5190/8249/files/convert_eu_to_rf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pujipipokumamidepuw.pdf
    • https://cdn.shopify.com/s/files/1/0435/8445/4817/files/36679829113.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6429/files/58970856661.pdf
    • https://cdn.shopify.com/s/files/1/0430/8729/8714/files/61064955148.pdf
    • https://cdn.shopify.com/s/files/1/0432/6883/3436/files/45480507648.pdf
    • https://cdn.shopify.com/s/files/1/0437/8047/2984/files/silap.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/google_translate_english_to_swedish.pdf
    • https://cdn.shopify.com/s/files/1/0431/4556/0226/files/16329537654.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_off00004510.bin
8079f9d1b968d22698e2346f5069d17dcabb68fc2e32d027fd0e46af2ae7ad79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4510 5660 bytes
font_01_sfnt_off00005832.bin
f48e96ac43ae9d97cc93bb32adcc77c344a32c991ea80a3114ed2f74d8bf28b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5832 8820 bytes
font_02_sfnt_off00007662.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7662 4324 bytes

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