Malicious PDF — malware analysis report

Static analysis result for SHA-256 252f03718d69cca8…

MALICIOUS

PDF

32.9 KB Created: 2020-08-23 03:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce363f9d6b6661067997efc39b1a758b SHA-1: 955bcc58da7f07fa76634529e104cc051317bd1e SHA-256: 252f03718d69cca893d8050cb5e7e2d55ee5c9f2c025d4bb1946c58556eef769
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com', which is likely part of a link farm strategy. Numerous other PDF links are embedded, many hosted on Shopify, suggesting an attempt to create a large network of linked documents. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL.

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=b.+p.+lathi+pdf
    • http://bipek.bighammershields.com/uploads/1/3/0/8/130874493/rewuzafesazaz.pdf
    • http://sojoxon.treehouseartisans.com/uploads/1/3/2/8/132816066/rejeripiwinifux-pexewiwezuxepa-bakadajiwib-xivag.pdf
    • http://files.energyoftheempires.com/uploads/1/3/1/4/131454383/dekatosofawo.pdf
    • https://cdn.shopify.com/s/files/1/0433/1274/2550/files/sojozinufotaxisapukabus.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27588499931.pdf
    • https://cdn.shopify.com/s/files/1/0432/4828/7912/files/nfc_forum_analog_technical_specification.pdf
    • https://cdn.shopify.com/s/files/1/0430/4856/6933/files/torefokosodezupeloni.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5807/files/96864818252.pdf
    • https://cdn.shopify.com/s/files/1/0429/9020/7139/files/45507796206.pdf
    • https://cdn.shopify.com/s/files/1/0429/5622/6716/files/kolalan.pdf
    • https://cdn.shopify.com/s/files/1/0431/2878/3002/files/midalubujirasapudaken.pdf
    • https://cdn.shopify.com/s/files/1/0437/3001/0273/files/que_es_el_sistema_capitalista.pdf
    • https://cdn.shopify.com/s/files/1/0439/6836/4702/files/aptitude_test_questions_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/8765637604.pdf
    • https://cdn.shopify.com/s/files/1/0433/2814/3510/files/73456267280.pdf
    • https://cdn.shopify.com/s/files/1/0431/2160/6820/files/62256829157.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_off0000475e.bin
eecbc7ffbae6217c4199a9976d40d7e38988a8cab966fde625387948b4a4c92f
pdf-font-stream PDF embedded font (sfnt) at offset 0x475E 4936 bytes
font_01_sfnt_off00005830.bin
87dff8ea0f2aa1088320f8ad2611cb485089724dec3592ba988dbe31b19ca8ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x5830 9040 bytes