Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a0780d7c628fc76…

MALICIOUS

PDF

47.1 KB Created: 2020-09-01 15:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3812a0f512498f7f4ddf0b8b6dfb64a7 SHA-1: 1343ed94f68511488709a9c1d0c293c817915682 SHA-256: 5a0780d7c628fc7604aca49e1708e5a279076ca107413b284d4a8761fd85ec0b
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, pointing to ttraff.ru. The document body, though heavily obfuscated, contains references to the target URL and other Shopify-hosted PDF files, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly flagged this PDF as malicious. The primary intent appears to be redirecting the user to malicious infrastructure via the ttraff.ru URL.

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/wix?keyword=kintex+ultrascale+ku060+datasheet
    • https://cdn.shopify.com/s/files/1/0430/5436/6877/files/55721638782.pdf
    • https://cdn.shopify.com/s/files/1/0434/1681/3735/files/small_ville_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/21320360722.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/47184882359.pdf
    • https://cdn.shopify.com/s/files/1/0437/8879/6053/files/51241218794.pdf
    • https://cdn.shopify.com/s/files/1/0431/9599/0175/files/auxiliary_transformer_sizing_calculation.pdf
    • https://cdn.shopify.com/s/files/1/0460/1777/3735/files/theban_plays_antigone.pdf
    • https://cdn.shopify.com/s/files/1/0437/6277/8264/files/gimibejojesufofepijilemu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63537272249.pdf
    • https://static.usrfiles.com/ugd/45e30f_9a91739663054233b78aa8a17fec3b7e.pdf
    • https://static.usrfiles.com/ugd/7198c1_4eb49ae342be4c279c65a0f00c3ffd26.pdf
    • https://static.usrfiles.com/ugd/b8c837_d59cec74088c4297bda894a3449ecb75.pdf
    • https://static.usrfiles.com/ugd/1df9ea_054490eb7ea04d9a9b1ebd694a842fb0.pdf
    • https://static.usrfiles.com/ugd/b8c837_a95941689db5425b9f4a0dd5103113fd.pdf
    • https://static.usrfiles.com/ugd/c63dba_5e96f65b6b564d04b4e7133d49350bce.pdf
    • https://static.usrfiles.com/ugd/f65175_739ad9a8a09d422798d5d64ec729fd35.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_off00006d9d.bin
15247f0ee3674dce9781624a20d76db3846e8171573deb131165b4ae166e8aba
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D9D 5424 bytes
font_01_sfnt_off00008003.bin
fd938e25dfbc84ed9cc67acca2a5ede3d3a4f38e3eee2aa1b41351810874c886
pdf-font-stream PDF embedded font (sfnt) at offset 0x8003 15432 bytes