Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61d2c5c27290a30…

MALICIOUS

PDF

41.8 KB Created: 2020-08-18 20:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38fd62fc7d37219862dda45b63785d87 SHA-1: 863564aa47cf813c397e851958634bfd97a35892 SHA-256: a61d2c5c27290a301a15a812b8ae2cb918b87a1407f940a5f5fd8cb22d98bf9a
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, with a critical heuristic firing for a malicious redirector link to 'https://ttraff.ru/pify?keyword=can+we+make+android+apps+using+python'. Another critical heuristic indicates a PDF link farm, with many links pointing to Shopify domains. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text but includes the same redirector URL and several Shopify URLs.

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=can+we+make+android+apps+using+python
    • http://files.leslieallyn.com/uploads/1/3/0/8/130873718/9744603.pdf
    • https://cdn.shopify.com/s/files/1/0430/0292/1111/files/loduriwujixulaluk.pdf
    • https://cdn.shopify.com/s/files/1/0429/1526/6713/files/86077615008.pdf
    • https://cdn.shopify.com/s/files/1/0429/5540/7519/files/microbiologia_veterinaria_libros.pdf
    • https://cdn.shopify.com/s/files/1/0437/2057/3080/files/xibabokimezoziximo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57790570823.pdf
    • https://cdn.shopify.com/s/files/1/0437/1628/0469/files/zereruwovej.pdf
    • https://cdn.shopify.com/s/files/1/0441/2515/9576/files/susapuponaserubujariva.pdf
    • https://cdn.shopify.com/s/files/1/0437/1428/1625/files/xusewuzod.pdf
    • https://cdn.shopify.com/s/files/1/0436/8472/4889/files/worthy_of_it_all_chords_e.pdf
    • https://cdn.shopify.com/s/files/1/0435/6535/1073/files/international_accounting_standard_38.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/nevubixizufi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7637/files/john_deere_tractor_repair_manuals.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_off0000643d.bin
7d565583eafcf84fc2c0a29cf7ac5b7c47c49c1ecd5c8853402651ad21da130e
pdf-font-stream PDF embedded font (sfnt) at offset 0x643D 5504 bytes
font_01_sfnt_off000076e4.bin
beb72a3952038eafdde14e6eb062f1f8ae0151db708bcd3d7959fd6b6eb712e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x76E4 10224 bytes