Malicious PDF — malware analysis report

Static analysis result for SHA-256 a768bbfb4bb60c92…

MALICIOUS

PDF

53.6 KB Created: 2020-08-29 17:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3990f0432bd5c1f23f6637efe08b625 SHA-1: 62f6ab561ca7fd394394649ba3098c032a98be46 SHA-256: a768bbfb4bb60c92ea753dd7709c0f158da0ddadc18fdbba3e1bb4aab8e86f14
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic firing for a malicious redirector link. The embedded URL, 'https://ttraff.cc/wix?keyword=meurt+acteur+en+rapido+et+furieux', is likely the primary mechanism for delivering a subsequent payload or leading the user to a malicious site. The file also contains a large number of external PDF links, suggesting a link farm or SEO poisoning attempt.

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/wix?keyword=meurt+acteur+en+rapido+et+furieux
    • https://static.usrfiles.com/ugd/b8c837_7c8bc529c4e34f1496d0b4591b5addac.pdf
    • https://static.usrfiles.com/ugd/b8c837_98fbcd487e8d4872953a609484692e11.pdf
    • https://static.usrfiles.com/ugd/b8c837_65753c6de48c4181ab587ea8a8e608a2.pdf
    • https://cdn.shopify.com/s/files/1/0434/6835/7796/files/zozivukebiteduvona.pdf
    • https://cdn.shopify.com/s/files/1/0437/5733/8776/files/jiwivikimuwomufipot.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/47125755779.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/75320426607.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fofigez.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6269/files/nijorasarategimap.pdf
    • https://cdn.shopify.com/s/files/1/0431/8609/4248/files/189687422.pdf
    • https://cdn.shopify.com/s/files/1/0431/8078/5823/files/diffusion_occurs_because_group_of_answer_choices.pdf
    • https://cdn.shopify.com/s/files/1/0432/7492/8286/files/89521658844.pdf
    • https://cdn.shopify.com/s/files/1/0431/4356/1384/files/54422369368.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_off00009069.bin
b048614525d5f3f4528d8e245f87c6e86757b14e82666efcf549a620bc579bbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x9069 5012 bytes
font_01_sfnt_off0000a193.bin
a30250e7c6e64f66b2f1a205bf9f3abc77db3acb3f3936cd514a6cfddad404d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xA193 12200 bytes