Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f5eaed56319911…

MALICIOUS

PDF

37.3 KB Created: 2020-08-25 08:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e00628ebee4d6e8f59801b3c96d2ec0e SHA-1: 38f9e9e97cd3737ac50453d13dc80c8008f7c91a SHA-256: d5f5eaed563199110dee4afb8abc985d00946c7d8c2252b11acca069640db471
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One critical heuristic identified a link to a known malicious redirector at https://ttraff.cc/pify. The document body, though partially corrupted, contains the same URL, suggesting the primary intent is to redirect the user to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/pify?keyword=pfc+boost+converter+waveforms
    • http://dupenuz.aabadventures.com/uploads/1/3/2/7/132712615/sosonuxulapef-pejuvipiko-wikarikafu-sukixodefuz.pdf
    • https://cdn.shopify.com/s/files/1/0436/0850/6531/files/4342435931.pdf
    • https://cdn.shopify.com/s/files/1/0432/9740/7126/files/how_to_become_a_good_english_speaker.pdf
    • https://cdn.shopify.com/s/files/1/0435/6879/1713/files/big_jambox_j2011_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/2578/5255/files/56874376694.pdf
    • https://cdn.shopify.com/s/files/1/0430/5911/8229/files/44771722601.pdf
    • https://cdn.shopify.com/s/files/1/0432/1725/6603/files/pugiwosi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2682/4863/files/31844736088.pdf
    • https://cdn.shopify.com/s/files/1/0438/9706/1531/files/rotexelatumabexiwonatozu.pdf
    • https://cdn.shopify.com/s/files/1/0443/1986/7036/files/mulogogojajusitusoto.pdf
    • https://cdn.shopify.com/s/files/1/0435/9349/8787/files/pebilarelagewatolama.pdf
    • https://cdn.shopify.com/s/files/1/0432/0614/8255/files/77785272620.pdf
    • https://cdn.shopify.com/s/files/1/0435/7901/5331/files/tokulivutibewumo.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_off000055a2.bin
f627610b6103cc2cc0f8f579db7864b87748b7e1edb896aeee2ca31aea763ab9
pdf-font-stream PDF embedded font (sfnt) at offset 0x55A2 5288 bytes
font_01_sfnt_off00006793.bin
b6c7972f7f49ebca5377139b36a9f93962c9722522e2e6f6fc0394d69c13cb62
pdf-font-stream PDF embedded font (sfnt) at offset 0x6793 9668 bytes