Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9fab26556a9c74b…

MALICIOUS

PDF

33.5 KB Created: 2020-08-20 09:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 082c80f8c3edb3c37e355c0785b58c66 SHA-1: 0e3a06c5a7d2f066bdde2401f76bab2179d54d8c SHA-256: b9fab26556a9c74bbb0e490a7c6f0c26d50e7dd8fa2522ed6f8dacacb1e77098
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=quarterly+report+format+for+cs+training'. This URL is likely used to redirect the user to a malicious site. The document body, though heavily obfuscated, contains references to the same URL and a large number of other PDF links, suggesting a link farm or redirection strategy. The ML classifier also strongly indicated maliciousness.

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=quarterly+report+format+for+cs+training
    • http://files.peacelovemonkey.com/uploads/1/3/1/6/131606630/2884479.pdf
    • http://files.brokenchainsbm.org/uploads/1/3/0/7/130739651/abbe66a.pdf
    • http://ketodug.jennypiersol.com/uploads/1/3/2/6/132683071/livabovokekexak.pdf
    • http://files.heavenlypoodlesanddodles.com/uploads/1/3/1/3/131379748/wofoduxapegudujat.pdf
    • https://cdn.shopify.com/s/files/1/0433/2270/4030/files/66757939235.pdf
    • https://cdn.shopify.com/s/files/1/0434/7301/0840/files/rumiwep.pdf
    • https://cdn.shopify.com/s/files/1/0431/4021/9041/files/dizofukujizedadugerumaxor.pdf
    • https://cdn.shopify.com/s/files/1/0428/4717/4812/files/dipubipafizuzafovuk.pdf
    • https://cdn.shopify.com/s/files/1/0462/2893/0709/files/xazeto.pdf
    • https://cdn.shopify.com/s/files/1/0436/9884/7896/files/xanasidu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3728/5797/files/womijopakigogax.pdf
    • https://cdn.shopify.com/s/files/1/0429/6150/2362/files/sample_introduction_for_lab_report.pdf
    • https://cdn.shopify.com/s/files/1/0430/0744/3103/files/96508127678.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2791/files/86192154251.pdf
    • https://cdn.shopify.com/s/files/1/0429/0537/0791/files/xorobifafevonowofalu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6939/0500/files/kujipiwasoxevurij.pdf
    • https://cdn.shopify.com/s/files/1/0434/3968/5799/files/22931676924.pdf
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/kezagaroritifufefeza.pdf
    • https://cdn.shopify.com/s/files/1/0428/0818/0895/files/kobogupamikulew.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_off00004788.bin
21a42758f12319b4ac0364ecc834ac4acb60620438f1079d365460c0b6378dcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4788 5500 bytes
font_01_sfnt_off00005a38.bin
e921770cb9e70747fe8121b0971c587874e8034b7e4b3f24d229093e8332e31d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A38 8988 bytes

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