Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08ac980f57d5822…

MALICIOUS

PDF

46.5 KB Created: 2020-08-16 15:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0ccb02a257f4c2364f43cfe49a70676 SHA-1: ee0037132208f31ef329e49f61d01755e6086624 SHA-256: a08ac980f57d5822b3086a7482d9f8e02eb77d0c2175d148cf8b03b32af3bb18
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lure users into clicking on further malicious links. The document body, though heavily obfuscated, contains the same URL and appears to be a link farm, attempting to disguise malicious links within seemingly legitimate content. 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.com/pify?keyword=nickel+cadmium+battery+construction+pdf
    • http://junawena.flrvc.org/uploads/1/3/2/7/132712315/6569448.pdf
    • http://gevevajeb.aestheticon.com.au/uploads/1/3/1/4/131407178/noroxidixeweweriko.pdf
    • http://texepe.verifiedpress.org/uploads/1/3/1/4/131406801/696408.pdf
    • https://cdn.shopify.com/s/files/1/0430/0960/5791/files/rupeviwokidupa.pdf
    • https://cdn.shopify.com/s/files/1/0438/8644/4699/files/37532278633.pdf
    • https://cdn.shopify.com/s/files/1/0432/7804/1244/files/72888595923.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5600/files/rawokasimisakazog.pdf
    • https://cdn.shopify.com/s/files/1/0430/4902/5690/files/38985150747.pdf
    • https://cdn.shopify.com/s/files/1/0438/2975/6066/files/gaxepegagina.pdf
    • https://cdn.shopify.com/s/files/1/0433/6094/4296/files/organic_chemistry_vollhardt.pdf
    • https://cdn.shopify.com/s/files/1/0429/5376/9123/files/82325101235.pdf
    • https://cdn.shopify.com/s/files/1/0435/3766/2103/files/l_argumentation_en_francais.pdf
    • https://cdn.shopify.com/s/files/1/0431/6990/6854/files/70686844592.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/87619010275.pdf
    • https://cdn.shopify.com/s/files/1/0438/2733/1232/files/72726365108.pdf
    • https://cdn.shopify.com/s/files/1/0431/1243/1776/files/vexudabufopowevugamivokik.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_off00007720.bin
2f45f3819c9f86ec5c440820536880faf690f500f805e7960c9a1a6dc0df88dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x7720 5576 bytes
font_01_sfnt_off000089ff.bin
4da1c60249348e24c6c561f02e78756cdd928cfdc0dc249c1e7f906b6c5a64dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x89FF 10304 bytes