Malicious PDF — malware analysis report

Static analysis result for SHA-256 b091a1431ae4f4a0…

MALICIOUS

PDF

46.4 KB Created: 2020-08-02 03:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a8b0f20d3726f66d77d8d999801f3b8 SHA-1: 2fb226fb97243e281ea1235ae19ab4d36a1dc746 SHA-256: b091a1431ae4f4a08b3d6790ce59ba3fbac088efb91c255394bc390002179d50
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. One prominent link redirects through 'ttraff.cc', a known malicious redirector, to a URL containing 'standard sata ahci controller driver' as a keyword, indicating a lure. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be social engineering via malicious links within the document.

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.cc/pify?keyword=standard+sata+ahci+controller+driver
    • http://files.eyretonponyclub.com/uploads/1/3/0/7/130775633/4d3dc1eb.pdf
    • http://files.ladderbird.com/uploads/1/3/1/4/131452811/67f8a2935d.pdf
    • http://files.laurennelsonyoga.com/uploads/1/3/1/8/131871849/c48ec39b5f.pdf
    • http://files.fhstrackandcross.org/uploads/1/3/0/7/130740222/6221014d7e16.pdf
    • http://files.radiant-wellness.com/uploads/1/3/2/8/132814933/9823942.pdf
    • https://cdn.shopify.com/s/files/1/0435/8779/7151/files/tinefon.pdf
    • https://cdn.shopify.com/s/files/1/0431/3917/0466/files/fimebobutexepiwaxit.pdf
    • https://cdn.shopify.com/s/files/1/0431/4044/8407/files/tojajaperapaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/2940/5600/files/robobilojufobededif.pdf
    • https://cdn.shopify.com/s/files/1/0429/0609/1673/files/lms_killbook_of_a_bounty_hunter.pdf
    • https://cdn.shopify.com/s/files/1/0428/1437/4054/files/23516023653.pdf
    • https://cdn.shopify.com/s/files/1/0432/9078/7996/files/fomikexisivekulovasa.pdf
    • https://cdn.shopify.com/s/files/1/0434/1373/3533/files/gapepupo.pdf
    • https://cdn.shopify.com/s/files/1/0436/3347/5737/files/delupowu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6187/0746/files/30082354235.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/
    • https://cdn.shopify.com/s/files/1/0429/0609/1673/files/lms_killbook_of_a_bounty_h

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077c1.bin
f2d3efaf0b07fa88ba173c7ac610ca2389b18abcd1eac182134eac5359520b80
pdf-font-stream PDF embedded font (sfnt) at offset 0x77C1 5192 bytes
font_01_sfnt_off00008962.bin
8c70d7ca896d30067b8123eacf6b2e316a946a742c3bce236c33e83daaa4bb32
pdf-font-stream PDF embedded font (sfnt) at offset 0x8962 10248 bytes