Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a7021475cf75d5…

MALICIOUS

PDF

37.7 KB Created: 2020-08-02 22:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd28f6addf94f23e6fbe7e4d9e7d6989 SHA-1: b5f1b463b2ee62a2bd33df7d0399b09d1d8156d6 SHA-256: 92a7021475cf75d53d474dc9f67e930520066391a8f027b96de97fbcf3ff4e67
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one heuristic specifically identifying it as a 'PDF SEO Link Farm'. The primary malicious link, 'https://ttraff.com/pify?keyword=j+cole+work+out', is a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and references to the malicious URL, suggesting an attempt to lure users into clicking these 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.com/pify?keyword=j+cole+work+out
    • http://files.oliveadobe.net/uploads/1/3/1/3/131383648/tudoxewepoter_rutuwujo_dakesijeba.pdf
    • http://files.magnusaircraftinc.com/uploads/1/3/0/7/130775583/segodojewag.pdf
    • http://files.autobodyassociation.org/uploads/1/3/0/7/130775245/fenovi_jijomidul.pdf
    • http://files.poisonivy-designs.com/uploads/1/3/2/6/132682819/32bcd527b1e9.pdf
    • https://cdn.shopify.com/s/files/1/0434/2503/8498/files/56054653401.pdf
    • https://cdn.shopify.com/s/files/1/0428/6434/5255/files/zizusomididibezivom.pdf
    • https://cdn.shopify.com/s/files/1/0433/0248/6180/files/sunojomarujawixepadofofus.pdf
    • https://cdn.shopify.com/s/files/1/0430/4217/7181/files/4192560885.pdf
    • https://cdn.shopify.com/s/files/1/0441/4488/5912/files/woketodapabaguka.pdf
    • https://cdn.shopify.com/s/files/1/0428/4838/7239/files/kilovokikemijajuzasukis.pdf
    • https://cdn.shopify.com/s/files/1/0432/8158/0188/files/gofoposaziwizupomojobimi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3902/2485/files/7845939647.pdf
    • https://cdn.shopify.com/s/files/1/0434/2589/0469/files/cox_tv_guide.pdf
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/6095511925.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61259485886.pdf
    • https://cdn.shopify.com/s/files/1/0432/2181/1364/files/pebijozogudikosefelepe.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_off00005866.bin
1067fc91e74129f66b08b50c8a423f8706daf60f1665f4288372c7f0c3c61bab
pdf-font-stream PDF embedded font (sfnt) at offset 0x5866 4548 bytes
font_01_sfnt_off00006805.bin
e61f8893856461ff55e3ae28c7181e7ab8ab14d98f29c5e6cad87cd23d92d8fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x6805 10000 bytes