Malicious PDF — malware analysis report

Static analysis result for SHA-256 834d91bc9ff91eb0…

MALICIOUS

PDF

39.7 KB Created: 2020-08-06 04:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 090b04a1699e006d90ecb01c7c687063 SHA-1: 0c9b2d6517ec3a8d09eab3e7d20f8a70739ab3b6 SHA-256: 834d91bc9ff91eb0f2bf3fb2d214a6c2aaca1ab97bd43a8a38e80c8d697bfdc6
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to external PDF files, characteristic of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=qcm+atomistique+paces+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect users to malicious content, likely for phishing or malware distribution.

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=qcm+atomistique+paces+pdf
    • http://favoliwa.drcots.com/uploads/1/3/1/4/131407148/korimuxewesuserupe.pdf
    • http://files.friendsofcookforest.org/uploads/1/3/2/8/132814958/latetazenas.pdf
    • http://files.kvag.net/uploads/1/3/0/7/130776346/3184610.pdf
    • http://files.littletonpreschool.com/uploads/1/3/2/6/132682892/74c8580.pdf
    • http://files.faithconnectionsonmentalillness.org/uploads/1/3/0/7/130739155/2543682.pdf
    • https://cdn.shopify.com/s/files/1/0434/6213/1869/files/zafilifegisinofu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7093/0600/files/giwemofixasopagot.pdf
    • https://cdn.shopify.com/s/files/1/0437/4754/1146/files/final_fantasy_15_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/4098/7543/files/merutazibixojoforazude.pdf
    • https://cdn.shopify.com/s/files/1/0428/6749/0975/files/801951851.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/43988142080.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nenipuwewof.pdf
    • https://cdn.shopify.com/s/files/1/0433/3748/2405/files/79525585185.pdf
    • https://cdn.shopify.com/s/files/1/0437/6710/3645/files/27135220896.pdf
    • https://cdn.shopify.com/s/files/1/0435/2560/3488/files/how_to_delete_twitter.pdf
    • https://cdn.shopify.com/s/files/1/0435/8687/9651/files/9436179243.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_off00005d31.bin
e20e40a6b714e8203cfd674f88533f79811ae5bb92a4ca57cfd2dc6732184cab
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D31 5360 bytes
font_01_sfnt_off00006f59.bin
02b7e3edc6db9a02510502f084ad2592b8c691b1973b49e610d7f5c26780fa7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F59 10240 bytes