Malicious PDF — malware analysis report

Static analysis result for SHA-256 443135dfa8b5554a…

MALICIOUS

PDF

58.0 KB Created: 2020-08-08 11:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd08ab68c14bb6316ce48da45087d601 SHA-1: 94f89e15d1421dafa386074bb13ae5ce9c6ca6bd SHA-256: 443135dfa8b5554a5e539c4f5c1350cf8b0a953c18dc4d786d36b8469d14c422
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link and a large number of external PDF links, suggesting a link farm for SEO manipulation or phishing. The embedded URL points to a redirector that ultimately leads to a malicious site. The document body, though heavily obfuscated, contains the URL that is also flagged by the redirector heuristic.

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=chili+s+nutrition+menu+pdf
    • http://files.faisalkababhut.com/uploads/1/3/1/3/131397981/4036505.pdf
    • http://files.masonjarstudio.ca/uploads/1/3/1/6/131637953/f4cd4c5f81b5f8.pdf
    • http://rirolal.relash.us/uploads/1/3/0/7/130775997/a21268077d.pdf
    • http://files.edsworldwide.org/uploads/1/3/2/7/132740320/sotilemiz-gukixedesimujar-bevulas-lativeponeji.pdf
    • https://cdn.shopify.com/s/files/1/0437/6818/4993/files/mole_mash_app_inventor_2.pdf
    • https://cdn.shopify.com/s/files/1/0429/5180/3033/files/fajanozexozapogonofuwe.pdf
    • https://cdn.shopify.com/s/files/1/0434/5744/6041/files/56541222642.pdf
    • https://cdn.shopify.com/s/files/1/0431/0256/8609/files/lusibuvabuwujegibexol.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38659434623.pdf
    • https://cdn.shopify.com/s/files/1/0437/7178/9470/files/minecraft_decoration_mod.pdf
    • https://cdn.shopify.com/s/files/1/0435/5316/1367/files/nepefokiribozizejugimexuk.pdf
    • https://cdn.shopify.com/s/files/1/0428/5782/4419/files/lepobeje.pdf
    • https://cdn.shopify.com/s/files/1/0428/4183/3635/files/55308092131.pdf
    • https://cdn.shopify.com/s/files/1/0435/7799/9519/files/69338177232.pdf
    • https://cdn.shopify.com/s/files/1/0431/8914/1664/files/welding_machine_wiring_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0428/0143/0695/files/mivisubawigor.pdf
    • https://cdn.shopify.com/s/files/1/0430/9660/4825/files/saxufitaxijuxidep.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_off0000a562.bin
93c8b1a63d215714a27b30ad95cd5e13c3857493bddecdface3ede8bf405407b
pdf-font-stream PDF embedded font (sfnt) at offset 0xA562 4976 bytes
font_01_sfnt_off0000b61b.bin
c3d3f2b2339b412ebd852ac08ce12829e7b467b2f034f4f9d961dbfc2beb5446
pdf-font-stream PDF embedded font (sfnt) at offset 0xB61B 10748 bytes