Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a39266859f6e96…

MALICIOUS

PDF

40.6 KB Created: 2020-08-03 09:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a407cab2432dfb4df01e416188e66ad SHA-1: 12c8e18827715bbe206818b88208e26142ed36ac SHA-256: b4a39266859f6e96aa97f73362db4814431405c2c2895af2f1f4ce2463fa18cf
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, identified as a link farm. One of these URLs, 'https://ttraff.cc/pify?keyword=positive+n+words', is flagged as a known malicious redirector. The presence of numerous links, many pointing to external PDFs, suggests an attempt to manipulate search engine results or distribute malicious content through a large network of linked documents. No scripts were extracted, and the document body is largely unreadable binary data.

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/pify?keyword=positive+n+words
    • http://dagegoku.bccnest.com/uploads/1/3/2/6/132681556/dipametataxeronupese.pdf
    • http://files.freharrodcorporation.com/uploads/1/3/2/6/132681969/xokuzururefixuv-mepov.pdf
    • http://files.cospempowered.org/uploads/1/3/1/3/131384101/4968865.pdf
    • http://files.seasidecrystals.com/uploads/1/3/1/8/131856173/16434d4d1.pdf
    • https://cdn.shopify.com/s/files/1/0432/7381/4182/files/winchester_ranger_120.pdf
    • https://cdn.shopify.com/s/files/1/0431/0574/7095/files/47280741082.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/56914313004.pdf
    • https://cdn.shopify.com/s/files/1/0432/4245/5207/files/97001524188.pdf
    • https://cdn.shopify.com/s/files/1/0441/4128/1432/files/aircrack_ng_mac.pdf
    • https://cdn.shopify.com/s/files/1/0439/2812/5595/files/34506019252.pdf
    • https://cdn.shopify.com/s/files/1/0433/9384/3358/files/rifimagudosow.pdf
    • https://cdn.shopify.com/s/files/1/0432/5195/7923/files/bajekobumixifojolid.pdf
    • https://cdn.shopify.com/s/files/1/0430/4207/8877/files/busixemonefemosomi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2308/1378/files/zujudusivudovi.pdf
    • https://cdn.shopify.com/s/files/1/0438/1681/2706/files/persona_3_guide.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_off0000632c.bin
1e072127c94a18ecdc0090ba5c5a21ae0a514815722f005243790b9197f61909
pdf-font-stream PDF embedded font (sfnt) at offset 0x632C 4728 bytes
font_01_sfnt_off00007365.bin
36e11d78c4203ad6541dad8d37aa85e03becd2ce6867b885325e40bd02022ca9
pdf-font-stream PDF embedded font (sfnt) at offset 0x7365 10088 bytes