Malicious PDF — malware analysis report

Static analysis result for SHA-256 58480bc2f44c85d6…

MALICIOUS

PDF

41.6 KB Created: 2020-09-02 04:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8e3be5c6ff369aebd72b84e584f3999 SHA-1: 11c368e12773999edbc620ade7556897e368ccf1 SHA-256: 58480bc2f44c85d66b03e250b6637dbe640bc3b0bf41ebd2520d08faf5100da3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final destination of the malicious payload. The document also contains a large number of external links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning tactic to increase visibility. The ML classifier strongly indicated maliciousness, and the PDF structure itself was flagged for containing a mass of external links.

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/wix?keyword=grim+fandango+guide+pdf
    • https://static.usrfiles.com/ugd/b8c837_41d861efb37249c79c5cdb82e032f555.pdf
    • https://static.usrfiles.com/ugd/3283b0_a17a96b834294fa7bd720c038ac5fddd.pdf
    • https://static.usrfiles.com/ugd/b48b60_d2ba98f07c074481995c181c67be1521.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/how_to_add_text_box_google_docs.pdf
    • https://cdn.shopify.com/s/files/1/0460/4185/8212/files/answering_overseas_call_m1.pdf
    • https://cdn.shopify.com/s/files/1/0431/6105/9482/files/java_swing_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/mixopameku.pdf
    • https://cdn.shopify.com/s/files/1/0430/7514/1783/files/romedifesub.pdf
    • https://static.usrfiles.com/ugd/73f3b0_48dbfb16220c4577b664be50358d8687.pdf
    • https://static.usrfiles.com/ugd/cc15ef_63450dbcd4b34ae5b66b1266e266a603.pdf
    • https://static.usrfiles.com/ugd/ae059d_47ed92d5b09e4000867773a57c8173c9.pdf
    • https://static.usrfiles.com/ugd/33a16d_257a93a8dafe4a0dbf4a7ebe0264e862.pdf
    • https://cdn.shopify.com/s/files/1/0428/6559/0438/files/shinra_mansion_safe.pdf
    • https://cdn.shopify.com/s/files/1/0428/3462/4679/files/59704009101.pdf
    • https://cdn.shopify.com/s/files/1/0431/7016/8986/files/jitesoponusimevena.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_off000065d5.bin
04b60fdfe76ab512a7e6f13196bb7f1a8afd095ff04a39bd4c9db9f7d27124f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x65D5 5180 bytes
font_01_sfnt_off00007762.bin
2657ee717bbf1fa048d4cf124b892fc914f2c9459c56c5f4578f585071116b6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7762 10024 bytes