Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1f72258cee828c…

MALICIOUS

PDF

44.9 KB Created: 2020-08-22 05:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4a296491a78c0b5ffa42f3699ecadf9 SHA-1: 3bebad78d095bfb792284021f743291a54b3c13c SHA-256: da1f72258cee828cc61ce2ebd31c636bc1ec2266195e23aed2c5a25212dafc6d
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to Shopify-hosted PDFs, suggesting an attempt at SEO poisoning or a link farm. One critical heuristic identified a link to a known malicious redirector at 'ttraff.ru'. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the document body and heuristics point to a redirection-based attack.

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=marbleslides+lines+answers+19
    • http://files.millersgardenservices.co.uk/uploads/1/3/1/6/131606128/lavezoxajuf.pdf
    • https://cdn.shopify.com/s/files/1/0436/8000/6294/files/xudapagapunakof.pdf
    • https://cdn.shopify.com/s/files/1/0433/8361/9736/files/wolfram_mathematica_11._0._1_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/83753273106.pdf
    • https://cdn.shopify.com/s/files/1/0432/1574/9281/files/puripin.pdf
    • https://cdn.shopify.com/s/files/1/0432/6440/9755/files/wovadenu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2873/3352/files/10965278772.pdf
    • https://cdn.shopify.com/s/files/1/0439/8995/8814/files/ratefisofebazoba.pdf
    • https://cdn.shopify.com/s/files/1/0437/7736/0029/files/ziwuwugovowagajakekeg.pdf
    • https://cdn.shopify.com/s/files/1/0434/9214/7352/files/3863682257.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6925/files/64000573883.pdf
    • https://cdn.shopify.com/s/files/1/0434/3159/2088/files/28049760202.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b59.bin
692c1d42fcbb23012f224370d5bbe9db3c34285a8af5d0dd652857c9f97a837b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B59 5264 bytes
font_01_sfnt_off00007d58.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D58 1800 bytes
font_02_sfnt_off000085e5.bin
d3eb5f62272d7efd82feac8ec3d7c9ec317b01e403bae747012babc5019310a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x85E5 9580 bytes