Malicious PDF — malware analysis report

Static analysis result for SHA-256 523213cb049b8faa…

MALICIOUS

PDF

34.8 KB Created: 2020-08-04 08:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7dc22d685e9d16eb4e0b4ee1aba0077 SHA-1: a00b49616b895facdf2cf4665f0d4343a82a4fbd SHA-256: 523213cb049b8faaff55aa21435cf4fd8bb182e7d58264e7c7f368db2160da2f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF document contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One of the primary links directs to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, also contains this URL, suggesting the intent is to redirect the user to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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/pify?keyword=modal+verbs+advanced+worksheet+pdf
    • http://files.centraljerseydyslexialearning.com/uploads/1/3/0/7/130740323/5664518.pdf
    • http://mumas.propertiesbypaula.com/uploads/1/3/1/4/131408738/wabufetanezu.pdf
    • http://files.keahisiberianhuskies.com/uploads/1/3/1/0/131070178/9601711.pdf
    • http://files.fishing-usa.com/uploads/1/3/0/8/130813557/5838118.pdf
    • http://files.mathgec.com/uploads/1/3/0/7/130775934/9902311.pdf
    • https://cdn.shopify.com/s/files/1/0437/9112/2584/files/11937862178.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66541571973.pdf
    • https://cdn.shopify.com/s/files/1/0436/5477/4949/files/cancer_de_pulmon_epidermoide.pdf
    • https://cdn.shopify.com/s/files/1/0435/2029/5064/files/76654071491.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/79603581161.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0825/files/15192456198.pdf
    • https://cdn.shopify.com/s/files/1/0432/9606/3643/files/97569167627.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0081/files/miloja.pdf
    • https://cdn.shopify.com/s/files/1/0438/3421/2509/files/9510903060.pdf
    • https://cdn.shopify.com/s/files/1/0436/4327/3369/files/budupakagezorupixerek.pdf
    • https://cdn.shopify.com/s/files/1/0433/3400/8987/files/dragon_ball_z_cell_saga_full_episodes.pdf
    • https://cdn.shopify.com/s/files/1/0434/5063/0296/files/nukafug.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_off00004a9b.bin
9ad5b81f4046d16b5757ecd4db36bdce8b2ca9706ed3877feb66543732fbcc20
pdf-font-stream PDF embedded font (sfnt) at offset 0x4A9B 5604 bytes
font_01_sfnt_off00005dbe.bin
d91312d91ad6beb674d10354cdcec6a26c3a67dbf20644ef24a7d6a0fb721a10
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DBE 9596 bytes