Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dd3d4536bb42bb6…

MALICIOUS

PDF

48.4 KB Created: 2020-09-14 06:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0378a1fe1845f647c5d12aa530f0870d SHA-1: 44bc66f28490e5bce431decade87fbaf2c3fee6a SHA-256: 2dd3d4536bb42bb645029531187ddea49b010bbf1e8aa33f1a01349e1247ef24
150 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, a technique often used for SEO poisoning or to redirect users to malicious sites. One of the primary links points to a known malicious redirector. The document body contains garbled text but includes the suspicious URL and a list of other URLs hosted on Shopify, likely part of the link farm. No scripts were extracted, and the file type is PDF, suggesting the primary malicious function is achieved through embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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/wix?keyword=coot+decoys+in+spread
    • https://cdn.shopify.com/s/files/1/0435/3346/7808/files/82409401933.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/tevewitowizazuf.pdf
    • https://cdn.shopify.com/s/files/1/0436/9121/2950/files/susevaliwukovutogugimabe.pdf
    • https://cdn.shopify.com/s/files/1/0438/8644/4696/files/english_word_stress_patterns.pdf
    • https://cdn.shopify.com/s/files/1/0430/1848/5923/files/harrison_internal_medicine_18th_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/6037/9286/files/descargar_musica_de_mana_rayando_el.pdf
    • https://cdn.shopify.com/s/files/1/0432/0568/9499/files/27371518711.pdf
    • https://cdn.shopify.com/s/files/1/0434/5249/8070/files/twist_of_the_wrist_2_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/8063/8879/files/bestiary_5_pathfinder.pdf
    • https://static.usrfiles.com/ugd/0994f9_7dfe3e7cccd64301a03e07c4c025b468.pdf
    • https://static.usrfiles.com/ugd/b8c837_3776a5ddc8e743ee883cc026ff267536.pdf
    • https://static.usrfiles.com/ugd/61567a_24669ac2defe459f879574f83380f294.pdf
    • https://static.usrfiles.com/ugd/3c9ac1_711690188238440ea36c8683a9cc23b0.pdf
    • https://cdn.shopify.com/s/files/1/0434/1750/1853/files/pathophysiology_of_peptic_ulcer_disease.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/kosubap.pdf
    • https://cdn.shopify.com/s/files/1/0439/4424/7451/files/43225465016.pdf
    • https://cdn.shopify.com/s/files/1/0433/7994/9718/files/biography_of_helen_keller_in_english.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_off00008073.bin
3fb308e2df616ab7df32bd23048c13e30e8fcdda544e8fc8c452ec1068aa8037
pdf-font-stream PDF embedded font (sfnt) at offset 0x8073 5044 bytes
font_01_sfnt_off000091ae.bin
c3df73a5010a324072b588587013ca3b375328a118b5d20ae897ce1176aef893
pdf-font-stream PDF embedded font (sfnt) at offset 0x91AE 10208 bytes