Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca06118d07ce3fd…

MALICIOUS

PDF

39.9 KB Created: 2020-08-02 07:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31742872425ba01a9dc94594dfd18b52 SHA-1: b16a4b98c1b5a7c8e32b6346930ffd4df2d94bc7 SHA-256: aca06118d07ce3fd933c5f1659f5160c3dd61b1a531802b1ac290790ab9e4c43
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 pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Bryant furnace parts manual' and the malicious URL, suggesting a lure to trick users into visiting a malicious site. 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=bryant+furnace+parts+manual
    • http://files.craftsbywayne.com/uploads/1/3/0/7/130739726/vibemibegusat_gexemupibezeg_fabotujosalidus_xalilifuzoxokeg.pdf
    • http://files.naturalisllc.net/uploads/1/3/1/8/131872238/0063df60f2ef7.pdf
    • http://files.ontmoetpalestina.nl/uploads/1/3/1/3/131383581/fosumabupasunok-disevo-sevarewabodax-kumunaduseve.pdf
    • http://files.mentaleclipsetheater.com/uploads/1/3/2/8/132814958/1421345.pdf
    • http://files.tiga-project.com/uploads/1/3/0/8/130874110/rafakusovojiga-zizezog-mipas-rulezilax.pdf
    • https://cdn.shopify.com/s/files/1/0440/7630/2486/files/52513907219.pdf
    • https://cdn.shopify.com/s/files/1/0428/4622/4551/files/74215128532.pdf
    • https://cdn.shopify.com/s/files/1/0431/8432/4770/files/15950228694.pdf
    • https://cdn.shopify.com/s/files/1/0436/2056/5156/files/31690045476.pdf
    • https://cdn.shopify.com/s/files/1/0430/8969/0773/files/suwoxiriwovifanu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8184/files/51252683025.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34680977850.pdf
    • https://cdn.shopify.com/s/files/1/0438/5813/3152/files/kikowapudafapuv.pdf
    • https://cdn.shopify.com/s/files/1/0437/7526/2869/files/58014439115.pdf
    • https://cdn.shopify.com/s/files/1/0429/0412/5599/files/13534528030.pdf
    • https://cdn.shopify.com/s/files/1/0431/6823/5682/files/xodenipefax.pdf
    • https://cdn.shopify.com/s/files/1/0430/7720/6165/files/goxilinikiwaru.pdf
    • https://cdn.shopify.com/s/files/1/0432/7548/5348/files/sizokoj.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_off00005d67.bin
2e9a497afe0e95fe24eeaac0bf9bcb359bdef065e2341d188d5253fa75add372		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D67 5312 bytes
font_01_sfnt_off00006f6f.bin
a74e9a832698405234c900e92d1545849d9e5c06f5a9582b284b9c19c474bc2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6F 10320 bytes

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