Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e7f59467bb85bb…

MALICIOUS

PDF

45.0 KB Created: 2020-08-21 09:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c188ee767e5816aa87b9570ec140a959 SHA-1: 5aed81b8674678965372cacf3dc5540393b32536 SHA-256: f8e7f59467bb85bb6049f90e1d4e1ca31a631bb5abf1bfced65091e9256ea022
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One critical heuristic indicates a malicious redirector link, which is likely the primary attack vector. The document body, though partially corrupted, suggests a lure related to 'application letter format for ojt business administration' to entice users to click the malicious URL. No scripts were extracted from this sample.

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=application+letter+format+for+ojt+business+administration
    • http://files.thequayboddie.com/uploads/1/3/2/6/132680870/6198391641.pdf
    • http://sutagi.babygurlcosmetics.com/uploads/1/3/0/7/130739845/8877570.pdf
    • http://files.reedblocks.com/uploads/1/3/0/7/130739658/9356006.pdf
    • http://vuzedi.sdsuzukiinstitute.com/uploads/1/3/0/7/130776031/geganukazumax.pdf
    • https://cdn.shopify.com/s/files/1/0432/7391/2488/files/75555842489.pdf
    • https://cdn.shopify.com/s/files/1/0431/0191/3244/files/vopegofawuninob.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/vatubunukafewesil.pdf
    • https://cdn.shopify.com/s/files/1/0436/2171/2034/files/black_female_names.pdf
    • https://cdn.shopify.com/s/files/1/0430/5931/4841/files/kamaku.pdf
    • https://cdn.shopify.com/s/files/1/0430/7435/5351/files/programming_fundamentals_coursera_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/3712/1951/files/55340545441.pdf
    • https://cdn.shopify.com/s/files/1/0447/3608/6172/files/class_9_biology_book_english_version.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gegexovikorojirokelaxedu.pdf
    • https://cdn.shopify.com/s/files/1/0447/4375/3879/files/midute.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_off00006822.bin
e00a50e943bfa808aebcd938000af0832ac3fe0aeaad8be85951d03745d751d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6822 5504 bytes
font_01_sfnt_off00007ab4.bin
fb2d32af925573c52378704b4e766864eb5f2edc49192ffc05040d0fc9aa4bfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB4 13968 bytes

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