Malicious PDF — malware analysis report

Static analysis result for SHA-256 e80fec11caf5d371…

MALICIOUS

PDF

42.2 KB Created: 2020-08-14 19:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e189bd9ebedc0efc650c5324e6d8875 SHA-1: 9610befc4c04fd2df5726f855a878da67659f031 SHA-256: e80fec11caf5d371b74408292c9a30e49b97e82418b5e7d612a71a66b0a28eeb
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector to a known malicious URL, indicating a phishing or scam attempt. The document body, though heavily obfuscated, contains text related to 'grade 4 math word problems worksheets pdf' and the malicious URL, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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.ru/pify?keyword=grade+4+math+word+problems+worksheets+pdf
    • http://files.touchdayspa.net/uploads/1/3/1/4/131453917/fipejikoxi.pdf
    • http://files.brownsvilleumc.com/uploads/1/3/1/8/131871424/lorafojunopux-kapef-lidusamabol.pdf
    • http://files.professionalcapitalpartners.com/uploads/1/3/1/1/131164009/d871229aecd51.pdf
    • http://files.littlepoppitsphotography.com/uploads/1/3/0/7/130740573/57d8b69405.pdf
    • https://cdn.shopify.com/s/files/1/0431/6302/5557/files/tratamiento_meningitis_bacteriana.pdf
    • https://cdn.shopify.com/s/files/1/0429/1097/4108/files/boxejegatuxavagagawizule.pdf
    • https://cdn.shopify.com/s/files/1/0433/7827/8563/files/26709739722.pdf
    • https://cdn.shopify.com/s/files/1/0439/4388/7016/files/nabafojufiga.pdf
    • https://cdn.shopify.com/s/files/1/0432/8118/6972/files/zovoxuwezobesu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9912/0033/files/jixogoboxuginusagafamekak.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/talerofu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8492/3555/files/73636130505.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2088/files/titejebuloxopifelaj.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5276/files/davonozurixipiwatizopi.pdf
    • https://cdn.shopify.com/s/files/1/0438/3378/6525/files/3758695860.pdf
    • https://cdn.shopify.com/s/files/1/0437/7280/5277/files/non_cognitive_skills_and_factors_in_educational_attainment.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_off00006530.bin
a593bb87b6d3e40f1f34da4dfd10316d0c7858bab3c21cdbf2ccff83ca1e5b36
pdf-font-stream PDF embedded font (sfnt) at offset 0x6530 5696 bytes
font_01_sfnt_off0000788e.bin
1380edfaf9ff353585011353fc3440e3b59bad7cff4e609a8d34d444cd196263
pdf-font-stream PDF embedded font (sfnt) at offset 0x788E 10352 bytes