Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa4c53583110e2e…

MALICIOUS

PDF

37.6 KB Created: 2020-08-29 13:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db5bccc0ab9bff7d98a0ae5e1a156a15 SHA-1: 102519acf07007e6b07445fa50634fb3286113ec SHA-256: 1aa4c53583110e2e0a80a883af4e7b7b3364a7968fac10ebd9cf713e7bcc4483
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm. One of these links, 'https://ttraff.ru/wix?keyword=dabbe+cin+%25C3%25A7arpmas%25C4%25B1+indir', points to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of the malicious URL is the primary indicator of compromise.

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=dabbe+cin+%25C3%25A7arpmas%25C4%25B1+indir
    • https://cdn.shopify.com/s/files/1/0429/8443/9971/files/2968799673.pdf
    • https://cdn.shopify.com/s/files/1/0431/5915/8946/files/93056863945.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gamusuzojikifikukudubug.pdf
    • https://cdn.shopify.com/s/files/1/0432/3747/4466/files/27022793211.pdf
    • https://cdn.shopify.com/s/files/1/0462/4079/2727/files/66723263817.pdf
    • https://cdn.shopify.com/s/files/1/0429/6212/4959/files/8811951420.pdf
    • https://cdn.shopify.com/s/files/1/0429/8362/0757/files/divinity_2_nude_mod.pdf
    • https://cdn.shopify.com/s/files/1/0432/5621/7750/files/simexagoxalabilob.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/83486451549.pdf
    • https://cdn.shopify.com/s/files/1/0431/8537/3333/files/63625575765.pdf
    • https://cdn.shopify.com/s/files/1/0429/7054/6335/files/45109353074.pdf
    • https://cdn.shopify.com/s/files/1/0439/0069/8792/files/6474419579.pdf
    • https://cdn.shopify.com/s/files/1/0430/6026/5117/files/xasunupuromubodibezividem.pdf
    • https://cdn.shopify.com/s/files/1/0440/5598/6341/files/math_worksheets_multiplication.pdf
    • https://cdn.shopify.com/s/files/1/0431/6083/0116/files/23121317016.pdf
    • https://cdn.shopify.com/s/files/1/0427/9799/0055/files/idioms_and_phrases_with_meanings_and_examples_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/1952/5531/files/dubujuza.pdf
    • https://cdn.shopify.com/s/files/1/0430/3421/4561/files/74941751999.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_off00005202.bin
9072419cb30d270d8f79da29fd5df28f7cb61731b305696e11bc351a74ae79ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5202 5540 bytes
font_01_sfnt_off00006472.bin
418ae5d0cf7b66af53fddadd76522b70d7e73170dac335ab5bd6e39fa3b0ebfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6472 11148 bytes

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