Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a5311b7513ab11f…

MALICIOUS

PDF

67.8 KB Created: 2020-09-01 12:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d88856e52f39e659da1e4b2576da103f SHA-1: d20c579bea531661b3e7aa4034735033c40e5e19 SHA-256: 0a5311b7513ab11f176a39dd79946cd1a0e1995dab1b667e2c55478a16f27da1
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, identified as malicious infrastructure. It also features a large number of embedded links, many pointing to PDF files, suggesting a link farm or SEO abuse tactic. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs confirms the intent to direct users to external 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.me/pify?keyword=jai+bajrang+bali+dj+song In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/3794ad_7b10c2d39da34fe8a009fd2c5a692458.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3826db_4021eaddd8d94e60824a6ea861a00bb6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0df15e_6eecaca9239a41e1b4b498478deaafd9.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/81d6a4_0129639d26a74735b726fb1e58260a67.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d94ae5_a1f16d49773b48f6bba93fe727655ea2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5802/7928/files/zironawigifijirikule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4211/0625/files/13151937112.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6843/2288/files/32483421518.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0f5b72_4afc5f68c8864e90aeb0148dd2445f3c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/71fd01_f40dd2dd39ad4cd68b4804add26d5737.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/1248/1177/files/xodaludoxizudovuvifina.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7554/1919/files/hiv_aids_signs_and_symptoms.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9724/2280/files/45836295438.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC506 5200 bytes
SHA-256: 1689af036511fccc3de1a57bf9c799149e4648ac54954bb675313bd6883194ba
font_01_sfnt_off0000d6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C1 14088 bytes
SHA-256: a235d8f2d72eb775b3c036ba6d7f67e6912b985232aadc0d12bb1a7b1338d268

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