Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e8afd60824cfa9…

MALICIOUS

PDF

56.7 KB Created: 2020-08-29 22:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16f9af4686ae953ef141ce871359d289 SHA-1: 5298e83514e40c95e51c65ae94d16fd8d45c193e SHA-256: f9e8afd60824cfa92f67535953d9aad23f594ae9f6ec1d9c4736509b6f8054ea
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, one of which is a Shopify URL. The ML classifier strongly indicated maliciousness. The primary attack vector appears to be luring the user to the 'ttraff.com' domain via the embedded 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.com/wix?keyword=no+man%252527s+sky+s+class+ship
    • https://cdn.shopify.com/s/files/1/0435/3867/7924/files/naming_organic_compounds_with_functional_groups_practice.pdf
    • https://cdn.shopify.com/s/files/1/0429/0733/6863/files/95684355938.pdf
    • https://cdn.shopify.com/s/files/1/0432/6385/2708/files/83284146990.pdf
    • https://cdn.shopify.com/s/files/1/0428/2938/1791/files/40613737506.pdf
    • https://cdn.shopify.com/s/files/1/0431/2485/0842/files/moral_values_definition.pdf
    • https://cdn.shopify.com/s/files/1/0435/7373/9675/files/effortless_english_pronunciation.pdf
    • https://cdn.shopify.com/s/files/1/0436/1817/3086/files/82498836372.pdf
    • https://cdn.shopify.com/s/files/1/0431/3700/7778/files/94032475927.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8480/files/45621552957.pdf
    • https://cdn.shopify.com/s/files/1/0436/5382/4677/files/81094342605.pdf
    • https://cdn.shopify.com/s/files/1/0431/5290/0260/files/nijepixibi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8424/2334/files/xasadepelumomiwig.pdf
    • https://cdn.shopify.com/s/files/1/0469/0667/1264/files/interpretao_de_texto_literrio_e_no_literrio_com_gabarito.pdf
    • https://cdn.shopify.com/s/files/1/0431/2065/6545/files/76324678247.pdf
    • https://cdn.shopify.com/s/files/1/0437/2067/1400/files/life_bucket_list_template.pdf
    • https://cdn.shopify.com/s/files/1/0428/8688/9625/files/velapaxi.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_off00009555.bin
ef748f5ccf895459155b88d82b082ac063e6d742294edb9050d7f734dce02e40
pdf-font-stream PDF embedded font (sfnt) at offset 0x9555 5248 bytes
font_01_sfnt_off0000a713.bin
9be38155bacb5f0b74fea22d9ed3bb4b519832cb3a5c47d0e29871fddd5f9aaf
pdf-font-stream PDF embedded font (sfnt) at offset 0xA713 15108 bytes