Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d1b58fa4e137c8…

MALICIOUS

PDF

54.0 KB Created: 2020-08-06 05:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6f828ca999a10b0a10772d935612e4a SHA-1: 9d583291629e84b34695afd8545742fd36f4e993 SHA-256: b2d1b58fa4e137c839ba77f5c48db95db519d56cc0c65abc9e9942ba0157d59b
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains text related to dividing PDFs and includes the same malicious URL. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering, tricking users into clicking the malicious link.

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=diviser%20pdf%20en%20plusieurs%20parties
    • http://files.twistedoysterboats.com/uploads/1/3/0/9/130969481/wijofiwekabuluf.pdf
    • http://files.starlingphotographydallas.com/uploads/1/3/1/8/131857140/xavegopaf-voviwilow-vosizudunal.pdf
    • http://files.birthtreasure.org/uploads/1/3/0/7/130740521/supuxanimetilowarixu.pdf
    • http://butafu.zyzzyx.band/uploads/1/3/0/8/130874431/861664.pdf
    • https://cdn.shopify.com/s/files/1/0435/2265/4362/files/22657365765.pdf
    • https://cdn.shopify.com/s/files/1/0429/2263/9527/files/polafilimunikexiworasediv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0507/4838/files/lajabatorejifavunixerar.pdf
    • https://cdn.shopify.com/s/files/1/0431/3668/0098/files/femavosavibakuduvaxutebul.pdf
    • https://cdn.shopify.com/s/files/1/0434/5934/6599/files/85186360562.pdf
    • https://cdn.shopify.com/s/files/1/0431/2917/6232/files/bootloop_nexus_5x_fix.pdf
    • https://cdn.shopify.com/s/files/1/0434/3329/6028/files/braun_multiquick_7_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/18113025230.pdf
    • https://cdn.shopify.com/s/files/1/0438/5030/1590/files/nedetadobik.pdf
    • https://cdn.shopify.com/s/files/1/0437/1893/4677/files/sulpirida_bula.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_off00008408.bin
bac1919627a3c61c1729d6045be3e3f589740b616e7216130797796a5328aaad
pdf-font-stream PDF embedded font (sfnt) at offset 0x8408 4868 bytes
font_01_sfnt_off000094a0.bin
c186c6fb0e2ffdb674fa003f22d6c09d17147c23fad243aecae91615014095b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x94A0 12492 bytes
font_02_sfnt_off0000bb6d.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6D 4324 bytes