Malicious PDF — malware analysis report

Static analysis result for SHA-256 717f9e3ae5c54e51…

MALICIOUS

PDF

42.3 KB Created: 2020-08-24 10:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 333405fa4f5d04346a17c9e0cc083da9 SHA-1: 8c420ec2d5612fe86844a38d678043eae24108a7 SHA-256: 717f9e3ae5c54e51acd8e5972c3af78cc7818ca1e63f7ed7844875b2d1b956b2
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a malicious redirector link disguised as a Kindle file converter, which is a common lure for phishing or malware distribution. The presence of a link farm with numerous PDF files hosted on Shopify suggests an attempt to manipulate search engine results to drive traffic to malicious sites. The ML classifier strongly indicated maliciousness, supporting the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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
  • 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.cc/pify?keyword=kindle+file+format+convert+pdf
    • http://povuwidu.theletterkstore.com/uploads/1/3/2/6/132681337/2289834.pdf
    • http://fevoki.nourishbodymindspirits.com/uploads/1/3/1/4/131406821/monogasu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2216/3876/files/59104975412.pdf
    • https://cdn.shopify.com/s/files/1/0429/4931/2666/files/bulusadabawiruzaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/9956/9829/files/xagebopikarigawe.pdf
    • https://cdn.shopify.com/s/files/1/0436/8865/7049/files/kamiguxigonaboguvi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3928/4645/files/ruwoxalideseziwabu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7013/6220/files/53336561505.pdf
    • https://cdn.shopify.com/s/files/1/0431/4519/9777/files/fesexirufan.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/calidad_de_vida_laboral_en_colombia.pdf
    • https://cdn.shopify.com/s/files/1/0434/3850/6146/files/ouran_highschool_host_club_episode_1.pdf
    • https://cdn.shopify.com/s/files/1/0432/8508/6374/files/blast_furnace_maintenance.pdf
    • https://cdn.shopify.com/s/files/1/0429/9456/5271/files/nordick_track_a2550.pdf
    • https://cdn.shopify.com/s/files/1/0440/5025/1941/files/nulowedaxa.pdf
    • https://cdn.shopify.com/s/files/1/0432/6791/5936/files/charminar_express_platform_in_secunderabad.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_off00006880.bin
83afd7d709b73bd243ef87621bdefb2a00783e04098e4e8ea92a23b8febaa56a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6880 5152 bytes
font_01_sfnt_off000079f0.bin
2a93e3bcee3b8766405ce626cf149fb08fd8d473fec70df176f80598390da52a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79F0 10120 bytes

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