Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7bb85d73c09a450…

MALICIOUS

PDF

36.7 KB Created: 2020-09-18 11:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc4d44c1154cd2c95da91b4edb579834 SHA-1: b33201a93ad42e74538ac99bfb5647dc1bac309d SHA-256: b7bb85d73c09a4502db847b0e95fa302cc0dfa936d76ddc891300247a5d585e1
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that are likely intended to deceive the user into clicking them, potentially leading to malware download or phishing.

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.link/wix?keyword=irulu+tablet+charger
    • http://nawura.academy522.com/uploads/1/3/1/6/131606407/1c3cdadb0046c.pdf
    • http://mexike.waverleyway.co.nz/uploads/1/3/1/4/131437243/jitasuzepezeb.pdf
    • http://files.ladyflowergardens.com/uploads/1/3/1/8/131856815/1011561.pdf
    • https://cdn.shopify.com/s/files/1/0429/2273/7830/files/pejaxoge.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/lojijawakugaxa.pdf
    • https://cdn.shopify.com/s/files/1/0427/8992/9116/files/disney_piano_solo_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0433/7431/3633/files/69152062457.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/jizavukiz.pdf
    • https://cdn.shopify.com/s/files/1/0430/4538/8437/files/all_my_life_i_pray_for_someone_like_you_lyrics.pdf
    • https://37712f3e-beb2-409c-b7ab-1472119b5cc0.filesusr.com/ugd/405339_054337ab001f47ef86f7ec15747df571.pdf?index=true
    • https://cd4c6002-f81f-4e49-83eb-59c49c4bd239.filesusr.com/ugd/1fa6dd_27d5b1f7954242b0a2d5aacb97472dbe.pdf?index=true
    • https://5b2ca0a7-f8d2-43d5-8ac7-f0f3d9ec59f3.filesusr.com/ugd/34e21e_a114dda960a8473c8f0d82815f263a53.pdf?index=true
    • https://fd8f06c5-d5ad-4d9e-9d59-55365033f04b.filesusr.com/ugd/6f5f23_8ac78ae042f5432ab5e843c0c4110b63.pdf?index=true
    • https://60810917-6518-4504-9463-661d2cce5f79.filesusr.com/ugd/97aff7_c41eaf0a9c024901b666ae4c0bdb4959.pdf?index=true
    • 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_off00005117.bin
b6a89aa5d4c0fadcfd10dd576e9ef493b4d77b2c66e53b9296afe80486a618af
pdf-font-stream PDF embedded font (sfnt) at offset 0x5117 4960 bytes
font_01_sfnt_off000061ec.bin
7ec613f50b92650afc1d9ecbc907408b6083e57e8afceba0a595cc070abca795
pdf-font-stream PDF embedded font (sfnt) at offset 0x61EC 10744 bytes