Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4cc97a79159c75…

MALICIOUS

PDF

48.2 KB Created: 2020-08-08 01:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37c8243260824cc9c6a80db8ceedf2e8 SHA-1: c92582e959e72372b2845f424cb7745c2e2746cd SHA-256: 5a4cc97a79159c756a0ab7013815a494ea3e322315f9f8ccc0606f9e97f93dc4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination of the malicious content. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of numerous other PDF links also indicates a link farm, a common tactic for SEO poisoning or distributing malicious content.

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.com/pify?keyword=que+es+auriculoterapia+pdf
    • http://files.quillcbd.com/uploads/1/3/0/7/130776254/bipoxumunuluf.pdf
    • http://files.slantsystem.com/uploads/1/3/1/3/131380337/9c47c4e65a81a.pdf
    • http://files.shoprebelmagnolia.com/uploads/1/3/1/4/131437464/8500229.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6289/4495/files/87694435901.pdf
    • https://cdn.shopify.com/s/files/1/0439/8009/5646/files/66599456244.pdf
    • https://cdn.shopify.com/s/files/1/0433/2732/4310/files/574702255.pdf
    • https://cdn.shopify.com/s/files/1/0438/1147/1520/files/76198321715.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28821374719.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4016/files/starting_a_business_in_california.pdf
    • https://cdn.shopify.com/s/files/1/0428/3406/7615/files/vukejol.pdf
    • https://cdn.shopify.com/s/files/1/0429/7005/4805/files/94234795907.pdf
    • https://cdn.shopify.com/s/files/1/0434/3165/7638/files/pujegotuzefusoliwuwif.pdf
    • https://cdn.shopify.com/s/files/1/0431/0004/5469/files/318_207_9557.pdf
    • https://cdn.shopify.com/s/files/1/0428/5261/4311/files/18024342924.pdf
    • https://cdn.shopify.com/s/files/1/0428/6955/5356/files/chemistry_a_molecular_approach_third_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/9423/7593/files/29918421177.pdf
    • https://cdn.shopify.com/s/files/1/0430/3791/7345/files/rabodarog.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b00.bin
16884f11ed41920bc2762b3cbd27ead55d77c250ed21aba21f0e778f554482c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B00 5212 bytes
font_01_sfnt_off00008cc8.bin
7273e97bef97978a7a5ac33f90792affe0ffe9ad5d94db16a295dfc9bd968bbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CC8 11420 bytes

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