Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb523e3e09ad46b…

MALICIOUS

PDF

46.0 KB Created: 2020-08-31 19:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 225a02db386f840ac12805e23a106be0 SHA-1: 6359898a30f117acbc754e28deaae0edebc7425f SHA-256: ecb523e3e09ad46be1e2192d25b849eb12067653e43851b99fda6996f5822b5a
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/wix?keyword=chokoloskee+fl+fishing+guides'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, including one to 'https://cdn.shopify.com/s/files/1/0434/0930/9848/files/saboxasegevor.pdf'. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine the exact lure beyond the presence of the malicious link.

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.ru/wix?keyword=chokoloskee+fl+fishing+guides
    • https://cdn.shopify.com/s/files/1/0434/0930/9848/files/saboxasegevor.pdf
    • https://cdn.shopify.com/s/files/1/0461/6683/5352/files/birthday_card_templates_photoshop.pdf
    • https://cdn.shopify.com/s/files/1/0443/8127/4278/files/58430046111.pdf
    • https://cdn.shopify.com/s/files/1/0428/7866/4867/files/negesi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5632/3995/files/xopukuxotutoserurilafevo.pdf
    • https://cdn.shopify.com/s/files/1/0428/3603/3695/files/flight_of_the_bumblebee_tuba.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/magej.pdf
    • https://cdn.shopify.com/s/files/1/0431/3346/8821/files/45354391871.pdf
    • https://cdn.shopify.com/s/files/1/0438/4705/7568/files/algebra_and_discrete_mathematics.pdf
    • https://cdn.shopify.com/s/files/1/0427/8000/0423/files/78834755587.pdf
    • https://cdn.shopify.com/s/files/1/0432/1257/0783/files/best_healthy_smoothie_recipes.pdf
    • https://cdn.shopify.com/s/files/1/0432/2859/4336/files/a_practice_grammar_of_german.pdf
    • https://cdn.shopify.com/s/files/1/0437/1113/5894/files/jusavasafisuweneg.pdf
    • https://cdn.shopify.com/s/files/1/0434/5056/4773/files/93835128565.pdf
    • https://cdn.shopify.com/s/files/1/0428/6912/9372/files/11310228744.pdf
    • https://cdn.shopify.com/s/files/1/0433/1651/0873/files/thanks_a_latte_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/6740/0601/files/87357133254.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_off000062ea.bin
2e54a21e72880ecc8152c70a484f44c25b265191ef9a5e3fe2afedc803a07986		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62EA 4832 bytes
font_01_sfnt_off0000735f.bin
a0666b42a00737a551e322c96b14258f443b86f8a33ce5f6f106fa119ba3b52c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x735F 10060 bytes
font_02_sfnt_off0000960b.bin
e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848		 pdf-font-stream PDF embedded font (sfnt) at offset 0x960B 16092 bytes

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