Malicious PDF — malware analysis report

Static analysis result for SHA-256 2849a7a56f776551…

MALICIOUS

PDF

43.6 KB Created: 2020-08-17 14:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fe46196d8d8d3eb8e26f9aa4959ad97 SHA-1: cbd389b29fb4573060e2a562c823f11f3f44e76b SHA-256: 2849a7a56f776551b01f80cefceaad0005eb43ed0a2cc5a12147ecc7ef238385
152 Risk Score

Malware Insights

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

The PDF contains a lure related to flight attendant interview questions, which is a common social engineering tactic. It embeds a link to `https://ttraff.ru/pify?keyword=flight+attendant+interview+questions+and+answers+examples`, identified as a malicious redirector. The document also features a large number of embedded links, many pointing to Shopify domains, but the primary malicious link is the redirector. The ML classifier strongly flagged this PDF as malicious.

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=flight+attendant+interview+questions+and+answers+examples
    • http://files.jjfshoes.com/uploads/1/3/0/9/130968996/774f16606b7a8.pdf
    • http://bepini.manassastowingservice.com/uploads/1/3/1/3/131380005/zerofuzudovezar.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1637/files/possessivpronomen_bung.pdf
    • https://cdn.shopify.com/s/files/1/0439/1682/0648/files/61555457604.pdf
    • https://cdn.shopify.com/s/files/1/0431/6443/4589/files/dewosilomojiw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuxevitilikibuvenimomabu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5350/6969/files/ample_history.pdf
    • https://cdn.shopify.com/s/files/1/0435/3042/0384/files/26731153608.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37357510366.pdf
    • https://cdn.shopify.com/s/files/1/0437/6995/4456/files/dj_niki_beluci.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/91489653134.pdf
    • https://cdn.shopify.com/s/files/1/0435/5407/8883/files/25844603351.pdf
    • https://cdn.shopify.com/s/files/1/0434/0659/0106/files/zobigebiguf.pdf
    • https://cdn.shopify.com/s/files/1/0435/9513/7187/files/85297501217.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_off00006b3e.bin
ceb687a792a60955b631d19ffb20ffd74c9644bcd65d0d0e4cc8cbe8c8c2d3b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B3E 5672 bytes
font_01_sfnt_off00007e6e.bin
a30f89d476d023ee0c6f6d3d42468becb47b7d40e20c5cd39f56943a4db338bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E6E 10208 bytes