Malicious PDF — malware analysis report

Static analysis result for SHA-256 402ec91b3d8f1a6b…

MALICIOUS

PDF

45.9 KB Created: 2020-08-25 01:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0d704c17b254e0ed4406503437e4af8 SHA-1: c4aabfae275fb69c780d6600ac314ec20fb3035c SHA-256: 402ec91b3d8f1a6b2897fb228cb6db81b0871e3f08b5f72b9e3b51f53aca076c
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, pointing to ttraff.cc. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on cdn.shopify.com. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=change+guardian+user+guide, suggesting a lure to a malicious site. The presence of a 'download button' heuristic further supports a malicious workflow.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=change+guardian+user+guide
    • http://files.bu-meds.org/uploads/1/3/2/7/132710732/5753235.pdf
    • http://files.bonsaiphilippines.com/uploads/1/3/1/4/131437919/kezozoki.pdf
    • http://files.trackfourjournal.com/uploads/1/3/1/4/131438190/xosusoginuruxejizu.pdf
    • http://files.crismarin.com/uploads/1/3/1/6/131607110/gaxasa.pdf
    • http://files.saltwaterandseaglass.com/uploads/1/3/0/7/130775084/rumorur-giduzerumerot-lurapazo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3486/8897/files/bamboo_cotton_sheets_australia.pdf
    • https://cdn.shopify.com/s/files/1/0431/4942/6845/files/motujoxadujotikojeri.pdf
    • https://cdn.shopify.com/s/files/1/0460/1328/4511/files/jusilofimizifetesog.pdf
    • https://cdn.shopify.com/s/files/1/0428/9275/5111/files/5239799201.pdf
    • https://cdn.shopify.com/s/files/1/0440/8098/8325/files/60931199573.pdf
    • https://cdn.shopify.com/s/files/1/0434/4214/3397/files/greedfall_parents_guide.pdf
    • https://cdn.shopify.com/s/files/1/0438/0770/3201/files/2274226278.pdf
    • https://cdn.shopify.com/s/files/1/0436/6965/1609/files/kuvekulebu.pdf
    • https://cdn.shopify.com/s/files/1/0427/8085/2383/files/viweragupesuv.pdf
    • https://cdn.shopify.com/s/files/1/0427/6004/4710/files/xopefuwalajudi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5770/9210/files/pulifewovugaju.pdf
    • https://cdn.shopify.com/s/files/1/0428/8921/6163/files/91359516270.pdf
    • https://cdn.shopify.com/s/files/1/0429/7742/7609/files/baiscope_korean_tv_series.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_off000074d0.bin
055b3ad96f77fb296adffc568977ee4b23c96271e1f69366841c2d01f3f49b1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x74D0 4960 bytes
font_01_sfnt_off0000859d.bin
52626f05755be12a5f7d7f4248db22b2c7430bfa892b10b6d840b7075077b50d
pdf-font-stream PDF embedded font (sfnt) at offset 0x859D 10920 bytes