Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e4cab0bfb819379…

MALICIOUS

PDF

50.1 KB Created: 2020-08-25 13:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed030cdf34cc41a00adf0dd62069fc13 SHA-1: cf91498c3cba05815cea0df4333ab94b2c37d8ac SHA-256: 1e4cab0bfb8193791d17f51627cf0b442ffa13f5927de6bb660577ff6e0e00b8
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure related to 'ocean of pdf legit'. The primary malicious URL identified is https://ttraff.com/pify?keyword=ocean+of+pdf+legit, which is likely used to redirect users to further malicious content. The presence of a large number of external PDF links, many hosted on cdn.shopify.com, suggests an SEO-based spam campaign.

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=ocean+of+pdf+legit
    • http://files.mymodernsolutions.ca/uploads/1/3/2/8/132815367/xofikevep-bazufu-givawa-moduwonun.pdf
    • http://files.nicoleedwardslimited.org/uploads/1/3/1/4/131406684/boredudikumamus_mologubavofazuz_kesivozukorateg_fizej.pdf
    • http://files.atkinsonbrassco.com/uploads/1/3/1/4/131437976/3196020.pdf
    • http://files.rabbitmountainlavender.com/uploads/1/3/0/7/130738625/futevukumuj_lulamatix_libujuferebetux.pdf
    • https://cdn.shopify.com/s/files/1/0462/6907/1511/files/archicad_19_software.pdf
    • https://cdn.shopify.com/s/files/1/0431/6200/9755/files/suvopubefavazib.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/lutulamimapesigis.pdf
    • https://cdn.shopify.com/s/files/1/0432/2535/0306/files/calculus_volume_2_apostol.pdf
    • https://cdn.shopify.com/s/files/1/0432/2266/3331/files/pomafimodudusu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1148/0472/files/58532894331.pdf
    • https://cdn.shopify.com/s/files/1/0434/8893/6102/files/fiwoduloket.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_off0000799b.bin
f9a25806a5d6de4d47cb504f7f0a3b3990e8bffd47ec847f591facee87641b4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x799B 4864 bytes
font_01_sfnt_off00008a35.bin
e5fec93bc7e0eaca28a182cb1b1b664508bbf85a346b6d38b8bf53319d6c958d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A35 10524 bytes
font_02_sfnt_off0000ae24.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE24 4324 bytes