Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae14ac77910bfdf5…

MALICIOUS

PDF

37.1 KB Created: 2020-07-30 10:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96aa1f5d1f4e459c26b9c4aa4844324c SHA-1: fb7a6f51c7feb5199826a6ca99795a8c4ccc902a SHA-256: ae14ac77910bfdf51075531e469ce24d1e450b89d5f54a692d0f6ca89c8a0c97
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector at 'https://ttraff.ru/pify?keyword=skf+slewing+bearing+catalogue+pdf'. The document body, though heavily obfuscated, appears to be a lure related to 'Skf slewing bearing catalogue pdf'. The presence of a link farm and the ML classifier's high confidence score further support a malicious intent, likely for phishing or malware delivery.

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.ru/pify?keyword=skf+slewing+bearing+catalogue+pdf
    • http://files.kakaengineering.com/uploads/1/3/0/7/130775619/8926720.pdf
    • http://files.charlottechinchristianchurch.com/uploads/1/3/1/4/131437792/c1f7c.pdf
    • http://files.millcreekbrangus.com/uploads/1/3/1/8/131856852/robatatabuvub_bemabat_fokube_wiwirurifiz.pdf
    • http://files.ucpgreatchefs.com/uploads/1/3/2/6/132682976/nunavenerogopafab.pdf
    • http://files.rainbowschoolmn.org/uploads/1/3/1/6/131606878/gulifefejalux.pdf
    • http://files.rainbowschoolmn.org/uploa
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70354855800.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/tedoxuvam.pdf
    • https://cdn.shopify.com/s/files/1/0430/8484/1124/files/sosorikasegogu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1720/6946/files/4966864763.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/zakukajeg.pdf
    • https://cdn.shopify.com/s/files/1/0428/5100/8671/files/51072797083.pdf
    • https://cdn.shopify.com/s/files/1/0435/4991/7347/files/zireju.pdf
    • https://cdn.shopify.com/s/files/1/0436/9180/2777/files/51018943060.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/73150905476.pdf
    • https://cdn.shopify.com/s/files/1/0432/0945/7825/files/60300251924.pdf
    • https://cdn.shopify.com/s/files/1/0438/0380/3808/files/lupekesegev.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_off000054f9.bin
0ab4066b865ac4ba6034922ae29d3a0104b8939a3c0863c8eff40e0ced44bae7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54F9 5604 bytes
font_01_sfnt_off0000681b.bin
da967a7c4c54741bdd8234157f17fe2926da9a34521405732c48053c5871729a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x681B 9148 bytes

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