Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad002830f3d5cdb…

MALICIOUS

PDF

42.5 KB Created: 2020-07-31 10:39:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04a96e465e62904ea609962734b98792 SHA-1: 31bc9581a21f1b8e57e85c4a322e948876488668 SHA-256: 8ad002830f3d5cdb76689d60fcd808bb1f661423bb42968558da0ea696de4c92
150 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Shopify domains, which is indicative of a link farm designed to improve search engine rankings for specific keywords. One critical heuristic identified a link to a known malicious redirector (ttraff.cc) disguised as a book download search result. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, suggesting it was programmatically generated.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=che+guevara+books+in+tamil+pdf+free+download
    • http://files.4lawsfamily.com/uploads/1/3/0/8/130874588/xuguwukob_kotejipalabo.pdf
    • http://files.quasilocum.com/uploads/1/3/1/3/131380733/dazepip-tefifipipewesex.pdf
    • http://files.taranakiequestrianjumping.com/uploads/1/3/1/6/131637108/mukafikinorovof.pdf
    • http://files.laborwlove.com/uploads/1/3/2/6/132681670/nakekorigibiveteven.pdf
    • http://files.anniezasadny.com/uploads/1/3/2/7/132740414/joridudinujuva.pdf
    • http://files.anniezasad
    • https://cdn.shopify.com/s/files/1/0437/2217/8710/files/29762354803.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6586/files/zibowosakefi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7297/0133/files/9746766411.pdf
    • https://cdn.shopify.com/s/files/1/0437/5583/1445/files/gaporuzot.pdf
    • https://cdn.shopify.com/s/files/1/0439/5424/1694/files/52313288925.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/katolase.pdf
    • https://cdn.shopify.com/s/files/1/0431/4365/9677/files/49869597764.pdf
    • https://cdn.shopify.com/s/files/1/0433/5815/9006/files/86342330387.pdf
    • https://cdn.shopify.com/s/files/1/0437/9174/5175/files/rizatorasedobamabatobim.pdf
    • https://cdn.shopify.com/s/files/1/0428/9832/5663/files/baboxizozabanebosegel.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasodidupafulad.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059d8.bin
18216af29503a1becc1c81ab12f848e331b7b97277db8753e12fc8e0a0ef50c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x59D8 5716 bytes
font_01_sfnt_off00006d36.bin
4268366b7f20943c26823d979657427c4d213034046da90b3a7c0ed1645c1817
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D36 3344 bytes
font_02_sfnt_off00007a46.bin
21183afddd4422f7f4734e1702cb347f0f0d59c4f57cb0f1ef52baed9779898f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A46 9948 bytes