Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d04c1ba99bed645…

MALICIOUS

PDF

49.1 KB Created: 2020-07-30 19:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b300972ad4d1ffcc01582fd404340ad4 SHA-1: 0a4a680a3e8b43cd28f93ef85e8426f1a677a4df SHA-256: 1d04c1ba99bed645155b190583172f9142bde1a17eaa4c60132561a9bfd0827f
128 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. Additionally, it exhibits a PDF link farm heuristic, suggesting SEO abuse to distribute malicious PDFs. The document body, though heavily obfuscated, contains text related to 'Bsc nursing entrance exam syllabus', aligning with the 'SE_INVOICE_LURE' heuristic. The primary attack vector appears to be a malicious redirector disguised as a document link.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/pify?keyword=bsc+nursing+entrance+exam+syllabus+2020+pdf+ruhs
    • http://files.mollymakesscents.com/uploads/1/3/0/8/130814682/9878703.pdf
    • http://files.wcacreatives.com/uploads/1/3/0/8/130814070/0d79b723c11.pdf
    • http://files.chapmanatsea.com/uploads/1/3/1/6/131606392/9578188.pdf
    • http://files.wcacreatives.com/uploads/1/3
    • https://cdn.shopify.com/s/files/1/0433/7133/1734/files/jajesogamapowabasilu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9988/9569/files/99407823640.pdf
    • https://cdn.shopify.com/s/files/1/0433/1867/3566/files/pulebubu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1449/6161/files/906596865.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0830/files/wawurumevebetozipus.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58143530911.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wadilizesiwegokadokepub.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3257/files/13011749163.pdf
    • https://cdn.shopify.com/s/files/1/0438/0537/6669/files/vomefazafufozuwa.pdf
    • https://cdn.shopify.com/s/files/1/0434/1379/9066/files/metukowotefefuxesapunep.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3645/files/tuwemimulijukuvanexi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9432/6949/files/66472014576.pdf
    • https://cdn.shopify.com/s/files/1/0433/3237/0584/files/tupar.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_off00007750.bin
e1d292c975108c2e49195e75e9bbd20e26707d212533551f811b143202cf59eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x7750 5976 bytes
font_01_sfnt_off00008b7b.bin
3989da49b524d5557add588dc2fe2de1fc87e2acee2178e43ffffbb929fdf0ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B7B 13888 bytes