Malicious PDF — malware analysis report

Static analysis result for SHA-256 c799b55449fc4e38…

MALICIOUS

PDF

55.4 KB Created: 2020-08-21 00:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57ad72bcfb0a54066f0172b20aa332ab SHA-1: e60ccaf6bb0dc02fdc96eaf7994d2375aeea05fc SHA-256: c799b55449fc4e3857399bdae0cc5db3d000b84ba3a2cbc4e3b43ec548ddc217
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link redirects to a known malicious domain (ttraff.ru). This suggests a link farm or SEO poisoning tactic to lure users with seemingly legitimate academic content towards a malicious redirector. The document body contains garbled text and the target URL, indicating a deceptive lure.

Heuristics 3

  • 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.
  • 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.ru/pify?keyword=business+management+ib+answers
    • http://files.skylinehoney.com/uploads/1/3/2/6/132681394/zavexokagixunitu.pdf
    • http://files.browsmith.com/uploads/1/3/1/4/131455398/bivalewuzajubiwe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9213/2508/files/linear_algebra_and_functional_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0428/9688/3868/files/46644314548.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8279/files/98892780179.pdf
    • https://cdn.shopify.com/s/files/1/0430/5934/7618/files/aday_retmen_kitap_formu_doldurulmu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0749/8647/files/64574289316.pdf
    • https://cdn.shopify.com/s/files/1/0443/0426/9468/files/genero_lirico_actividades.pdf
    • https://cdn.shopify.com/s/files/1/0429/9830/0823/files/free_equalizer_for_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0432/4609/2443/files/wigaf.pdf
    • https://cdn.shopify.com/s/files/1/0435/3222/2615/files/dipunudujuwomar.pdf
    • https://cdn.shopify.com/s/files/1/0428/5467/8687/files/kegarikusemoniduwak.pdf
    • https://cdn.shopify.com/s/files/1/0431/2013/2257/files/75562367190.pdf
    • https://cdn.shopify.com/s/files/1/0428/6713/0534/files/51530844288.pdf
    • https://cdn.shopify.com/s/files/1/0428/9714/6019/files/airmax_pneumatic_cylinder_catalogue.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_off00009b82.bin
3620cc034b0f03e0a1a7c58ef8d7c664a2c4d556c1fe89960b1db12fec285558		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B82 5252 bytes
font_01_sfnt_off0000ad53.bin
f22ecca345e993a1bcdf91e94b251768027533ae1d33d2f5c3479bc92163aafa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD53 10436 bytes

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