Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c1b67abb0e81e6…

MALICIOUS

PDF

52.4 KB Created: 2020-08-23 05:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a21ca7920dda8fbc50ad6cde27392b8f SHA-1: 47fb9ecc31b52f0fc63c0549c945304115a3623a SHA-256: 61c1b67abb0e81e69a5fca0f325a2ad069054904e2cd6f21033af78039217ebe
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One of the primary links, however, redirects to a malicious domain known for hosting redirectors. This suggests a link farm or SEO poisoning attack designed to funnel users to malicious content, likely for phishing or malware distribution.

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=geometry+textbook+answers+chapter+10
    • http://fogirizax.mitchadvent.com/uploads/1/3/1/6/131637046/tajujisokifa_gojedomobeke.pdf
    • http://files.synergybai.com/uploads/1/3/1/8/131856333/xukadiden_sadulixom_nalowa_panabij.pdf
    • http://files.idmodules.com/uploads/1/3/1/4/131407369/pemugik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/34655778455.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/futijifinerodujumagos.pdf
    • https://cdn.shopify.com/s/files/1/0437/7988/3170/files/13520332919.pdf
    • https://cdn.shopify.com/s/files/1/0428/8295/7478/files/human_activities_affect_the_environment.pdf
    • https://cdn.shopify.com/s/files/1/0431/7210/2308/files/90988515791.pdf
    • https://cdn.shopify.com/s/files/1/0427/7947/6134/files/kapenar.pdf
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/91673978587.pdf
    • https://cdn.shopify.com/s/files/1/0457/3347/8566/files/identifying_theme_in_poetry_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8039/files/feneb.pdf
    • https://cdn.shopify.com/s/files/1/0431/4916/4705/files/jasafe.pdf
    • https://cdn.shopify.com/s/files/1/0440/4294/4677/files/kesorejinuwepo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8620/9443/files/imdb_boss_baby_parents_guide.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073f8.bin
fc83e8d4fbfb4f4656782d643de776301411cf099733c7eaf89e63785133ba84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73F8 5832 bytes
font_01_sfnt_off000087c7.bin
8e0a0501cc954b74c8b9049863b215ecbcae3205233393708530a4b2a62b0957		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87C7 11548 bytes
font_02_sfnt_off0000af4a.bin
eb9c46ad6ba70e1be9159efd138f9a7c551dff3884d1a2ed7bdd60ddb162775e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF4A 16128 bytes

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