Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d04fb46a39afd0d…

MALICIOUS

PDF

40.5 KB Created: 2020-08-18 16:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee3a4209a67718f1fd427d5a292f4fde SHA-1: f7bd9ecbfb16fe1db08c01b95e3c3240a9726b87 SHA-256: 1d04fb46a39afd0d19fede1dd20d2f1b5d43bc028dc484a982c808532d13af5e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a prominent link disguised as a crack download for "Asphalt 8 pc crack", which redirects to a malicious URL. The document also contains a large number of links to external PDFs hosted on Shopify, likely for SEO manipulation to improve search engine ranking for the malicious content. The ML classifier 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.ru/pify?keyword=asphalt+8+pc++crack
    • http://gokalome.oshkoshmainstreetmusicfestival.com/uploads/1/3/1/4/131407995/rozolun.pdf
    • http://tekevad.homepick.us/uploads/1/3/2/6/132682717/06af58.pdf
    • http://files.marc7travels.com/uploads/1/3/2/7/132710721/8415558.pdf
    • https://cdn.shopify.com/s/files/1/0439/8442/1022/files/additive_inverse_worksheet_7th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0430/8225/2442/files/weduwatirilubemikasap.pdf
    • https://cdn.shopify.com/s/files/1/0431/8144/1181/files/74655462175.pdf
    • https://cdn.shopify.com/s/files/1/0429/2273/7830/files/system_architecture_github.pdf
    • https://cdn.shopify.com/s/files/1/0429/6186/2810/files/tidexiwav.pdf
    • https://cdn.shopify.com/s/files/1/0429/2503/1590/files/33764142774.pdf
    • https://cdn.shopify.com/s/files/1/0433/5265/3973/files/29652483708.pdf
    • https://cdn.shopify.com/s/files/1/0430/9535/9641/files/61705517420.pdf
    • https://cdn.shopify.com/s/files/1/0434/7183/1193/files/wewijiwedakobokusubo.pdf
    • https://cdn.shopify.com/s/files/1/0433/1444/6489/files/wirojirudegid.pdf
    • https://cdn.shopify.com/s/files/1/0431/5758/6071/files/lajegapawuzoxometadupaku.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_off000060a9.bin
f36e3beb93d6f48da24b7e406ca6bdc13cc2e07e878c770a69161e9eef1d33fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x60A9 5268 bytes
font_01_sfnt_off00007280.bin
6288ac889721ddbfa95d848ac987c2371d235e188da1e0a11a6f5ca505a68849
pdf-font-stream PDF embedded font (sfnt) at offset 0x7280 10292 bytes