Malicious PDF — malware analysis report

Static analysis result for SHA-256 458eaa87815cd13c…

MALICIOUS

PDF

50.3 KB Created: 2020-08-03 16:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb5263fe480e1d1ee65c9a122aab136f SHA-1: 8ed90cb7b5c90209209967ef7610310e91eb90ca SHA-256: 458eaa87815cd13c753e460dfad7cf31f8f6514fdfda057babb3d732fff6d548
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical link to a known malicious redirector at https://ttraff.ru/pify?keyword=positive+affirmation+quotes+pdf. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to redirect the user to malicious infrastructure. 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=positive+affirmation+quotes+pdf
    • http://files.groundedlearning.com/uploads/1/3/1/8/131856195/nesisatewesi.pdf
    • http://files.sparklesandspitballs.com/uploads/1/3/2/6/132681426/zuxevijegovuvoxo.pdf
    • http://files.amygerak.com/uploads/1/3/1/3/131398000/8632293.pdf
    • https://cdn.shopify.com/s/files/1/0429/8578/3455/files/81442573517.pdf
    • https://cdn.shopify.com/s/files/1/0431/0034/0381/files/73086937601.pdf
    • https://cdn.shopify.com/s/files/1/0430/7265/1413/files/xirelapirapif.pdf
    • https://cdn.shopify.com/s/files/1/0432/3128/1312/files/54614176348.pdf
    • https://cdn.shopify.com/s/files/1/0431/0574/7108/files/batib.pdf
    • https://cdn.shopify.com/s/files/1/0427/7580/6119/files/jajaliv.pdf
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/tetesefawi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5072/9621/files/jujitomukarotunijoz.pdf
    • https://cdn.shopify.com/s/files/1/0429/7395/4204/files/17555361424.pdf
    • https://cdn.shopify.com/s/files/1/0427/6705/7063/files/ruvovezuliwaximumirojej.pdf
    • https://cdn.shopify.com/s/files/1/0428/4183/3635/files/gojed.pdf
    • https://cdn.shopify.com/s/files/1/0435/8235/7663/files/south_western_federal_taxation_2018_solutions.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_off00008749.bin
e4a8bd4da05c7e9566e5054b215e684bd8b78b1c2fefb39c0d4a4601f890e077
pdf-font-stream PDF embedded font (sfnt) at offset 0x8749 5340 bytes
font_01_sfnt_off0000996b.bin
8fb391bafda2ff734367fa6e8f26da80aaa7f7d8be82035a088ccad257d341be
pdf-font-stream PDF embedded font (sfnt) at offset 0x996B 10300 bytes