Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3176eda0d331648…

MALICIOUS

PDF

34.2 KB Created: 2020-08-21 08:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdd8bf5ab667dd1eaed39fab6a283538 SHA-1: 0da7544550295fc7c8df66612b549c6c1bfca337 SHA-256: b3176eda0d3316480d7472fddd15a656ad4f1fcf536b491497a9ed56d6124642
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for media content, directing users to the malicious URL. The presence of a large number of external links, many pointing to Shopify, suggests a link farm or SEO manipulation tactic to obscure the malicious redirector.

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=asuran+full+bgm++tamil
    • http://files.cwhiteslight.com/uploads/1/3/0/8/130813643/lazurawuv_toziva_wijedokixawiwus.pdf
    • https://cdn.shopify.com/s/files/1/0432/4684/6107/files/86470094877.pdf
    • https://cdn.shopify.com/s/files/1/0436/2049/9616/files/38267305029.pdf
    • https://cdn.shopify.com/s/files/1/0431/4978/7285/files/55205008446.pdf
    • https://cdn.shopify.com/s/files/1/0432/6899/7283/files/33324322963.pdf
    • https://cdn.shopify.com/s/files/1/0433/3273/1038/files/78408666420.pdf
    • https://cdn.shopify.com/s/files/1/0433/5314/5495/files/anatomy_of_the_digestive_system_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0430/8670/8893/files/3210531784.pdf
    • https://cdn.shopify.com/s/files/1/0431/5421/0980/files/78904187195.pdf
    • https://cdn.shopify.com/s/files/1/0436/1938/5504/files/lazard_lcoe_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/3823/6062/files/71416011219.pdf
    • https://cdn.shopify.com/s/files/1/0440/4235/4853/files/zokigeninopeputotimunu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3397/6223/files/43943334841.pdf
    • https://cdn.shopify.com/s/files/1/0427/5788/2022/files/75739772212.pdf
    • https://cdn.shopify.com/s/files/1/0435/2658/6527/files/67051842156.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_off000048d0.bin
f467dd0217578498f79d1db58f17785e0d0b4e5f6bf35fbee4a9104e83dacaca
pdf-font-stream PDF embedded font (sfnt) at offset 0x48D0 5216 bytes
font_01_sfnt_off00005a71.bin
f79c20978cb202a5bfdc67ed325861d277308c50f4248635975f0dc5b380f538
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A71 9948 bytes