Malicious PDF — malware analysis report

Static analysis result for SHA-256 6acf5c3409ec40cb…

MALICIOUS

PDF

61.5 KB Created: 2020-08-15 06:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3f61ade924d2e2068ec29c107703c91 SHA-1: 41674748a9558fcd7a7c11231d736b50a1a3efb1 SHA-256: 6acf5c3409ec40cbbaef8f2c597cf21d90bd4cfa5c60652464907e6c37e79af0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that likely lead to further malicious content or phishing pages. The presence of numerous links suggests an attempt to distribute malware or phish users through a link farm.

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/wb?keyword=fippa%20iran%20pdf
    • http://kajot.daedalusinnovation.com/uploads/1/3/1/6/131607984/35acd59c694.pdf
    • http://files.newkirkbc.org/uploads/1/3/1/3/131379899/6f90aae3d85.pdf
    • http://wedam.redlodgecountryproduce.com/uploads/1/3/0/7/130776485/viginise.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8118/8003/files/jasixo.pdf
    • https://cdn.shopify.com/s/files/1/0429/3305/9737/files/78731197801.pdf
    • https://cdn.shopify.com/s/files/1/0434/5639/7464/files/vazam.pdf
    • https://cdn.shopify.com/s/files/1/0439/4093/7896/files/7511228072.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9798/files/dujug.pdf
    • https://cdn.shopify.com/s/files/1/0429/5147/5351/files/fozowevetewerezojavi.pdf
    • https://cdn.shopify.com/s/files/1/0428/4222/6854/files/43974933630.pdf
    • https://cdn.shopify.com/s/files/1/0430/4856/6941/files/49846544752.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0839/files/dream_on_drum_chords.pdf
    • https://cdn.shopify.com/s/files/1/0431/5850/3590/files/rollercoaster_tycoon_3_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/4711/6185/files/learning_and_behavioral_psychology.pdf
    • https://cdn.shopify.com/s/files/1/0429/6884/2393/files/rijekavivi.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4d0.bin
420349003100d6fce7c70c5c18dc7a21273c959e79714e0a10503804b454ceb4
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D0 4780 bytes
font_01_sfnt_off0000c523.bin
556f6ef0a8b098bf3058a8c2ac887ca1bf2e103cc5c905766ec593cc978e7cc7
pdf-font-stream PDF embedded font (sfnt) at offset 0xC523 10740 bytes