Malicious PDF — malware analysis report

Static analysis result for SHA-256 01d9557ede10cc6d…

MALICIOUS

PDF

38.0 KB Created: 2020-08-08 14:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56ecd8d5141c0d01c0a1c300c4ced7d8 SHA-1: b283987e1dbbffb59bb5b6fa5f07a25f78d28e7c SHA-256: 01d9557ede10cc6d619d0cf42786363f774dcc3ba34778af600ea71a4da62caa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a redirector to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The embedded URL, https://ttraff.com/pify?keyword=merge+pdf+files+into+one+adobe+reader, is designed to lure users into clicking it under the guise of a utility. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=merge+pdf+files+into+one+adobe+reader
    • http://files.nickholtlcsw.com/uploads/1/3/1/6/131636697/lirexuvepabo.pdf
    • http://files.cruisingwithdonandglynda.com/uploads/1/3/1/3/131384145/8947110.pdf
    • http://files.gohstheatre.com/uploads/1/3/0/8/130813834/4225295.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/makasezadaxotupuvogadasi.pdf
    • https://cdn.shopify.com/s/files/1/0428/8276/0870/files/assignment_writing_format.pdf
    • https://cdn.shopify.com/s/files/1/0434/8579/0365/files/bevilodowajabiwibuzijone.pdf
    • https://cdn.shopify.com/s/files/1/0441/1208/5144/files/nasaligaxokabobafaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/2211/3192/files/92438228863.pdf
    • https://cdn.shopify.com/s/files/1/0430/2359/7725/files/33509725681.pdf
    • https://cdn.shopify.com/s/files/1/0435/0155/1771/files/goraxisoraninorewigujex.pdf
    • https://cdn.shopify.com/s/files/1/0434/3041/2437/files/how_do_you_bypass_a_revoked_certificate.pdf
    • https://cdn.shopify.com/s/files/1/0431/1315/2673/files/xazejotiloko.pdf
    • https://cdn.shopify.com/s/files/1/0429/2873/4367/files/babosujilirozosi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5161/3334/files/24598359295.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057ad.bin
019eb32c553cb5ca26f769d5bb135ff40bf1c6a5225ac698999dd09615fe736f
pdf-font-stream PDF embedded font (sfnt) at offset 0x57AD 5352 bytes
font_01_sfnt_off000069fa.bin
5501d59641210373a4939a17147d074b2a6073a5359f370afbd12099af10ea30
pdf-font-stream PDF embedded font (sfnt) at offset 0x69FA 9728 bytes