Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ec6708e53296dd…

MALICIOUS

PDF

35.7 KB Created: 2020-08-19 07:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29387358b7f48f72e1bd2c9e4881709f SHA-1: e24ab989803c3775d2b013c7a5dbe0f06cabea4c SHA-256: d6ec6708e53296dde1b6b20cb356625e4caa4f1283a0b108cf43b057a29730d7
154 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=flightless+bird+piano+sheet+music+pdf`. This indicates the document's primary purpose is to lure users to a malicious site. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to obscure the malicious redirect. No scripts were extracted from this sample.

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=flightless+bird+piano+sheet+music+pdf
    • http://nefolana.tbruederl.com/uploads/1/3/1/4/131452977/wapefosixukuxobiwut.pdf
    • http://xaxiga.shrewddigitalmarketing.com/uploads/1/3/2/7/132740748/18a3369d913d.pdf
    • http://files.hommersaakutleie.com/uploads/1/3/0/7/130775528/6995101.pdf
    • http://files.bytracycahill.com/uploads/1/3/1/0/131070420/sifawurele.pdf
    • https://cdn.shopify.com/s/files/1/0428/7424/1183/files/7156938327.pdf
    • https://cdn.shopify.com/s/files/1/0437/2260/4695/files/classical_approach_to_management_theory.pdf
    • https://cdn.shopify.com/s/files/1/0434/7835/2034/files/jemedivijikupasul.pdf
    • https://cdn.shopify.com/s/files/1/0438/6488/3355/files/2373995692.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/91423086786.pdf
    • https://cdn.shopify.com/s/files/1/0427/9359/9132/files/15138940828.pdf
    • https://cdn.shopify.com/s/files/1/0433/2247/4651/files/18653924023.pdf
    • https://cdn.shopify.com/s/files/1/0431/0145/4500/files/acustica_fisica_musical.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/88075317933.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/miveguxuxububepevomozit.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_off00004db8.bin
a94d478ffbe766e918feb5de230e19afe955e4fa0e3614f254c678e3d6295eaa
pdf-font-stream PDF embedded font (sfnt) at offset 0x4DB8 5664 bytes
font_01_sfnt_off000060c6.bin
12278c47013e552d9ff3e48bc1d0704faab4937fadeab00a27c5f173f9d3a998
pdf-font-stream PDF embedded font (sfnt) at offset 0x60C6 9716 bytes