Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da9caf7b03f50f6…

MALICIOUS

PDF

43.8 KB Created: 2020-08-02 17:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 162c035803ea186cdcb132d14f7eab9f SHA-1: 8d982344fe644ef54cc243cacd4e679b29aecde9 SHA-256: 8da9caf7b03f50f6dd0b59623beb285537ba14ac4bf300eeec0dfddbd26c8fde
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The embedded links likely serve to distribute malicious content or phish users. 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.com/pify?keyword=vijay+tv+programme
    • http://files.dalegarellphotography.com/uploads/1/3/2/6/132681969/6000069.pdf
    • http://files.colorioorganics.com/uploads/1/3/0/7/130775084/folosugamoj.pdf
    • http://files.sandrapaolalopez.com/uploads/1/3/0/8/130813988/2511042.pdf
    • http://files.xebex.eu/uploads/1/3/0/8/130814575/xofoma.pdf
    • http://files.gabiroach.com/uploads/1/3/1/6/131637309/2466201.pdf
    • https://cdn.shopify.com/s/files/1/0430/3064/2837/files/50542897944.pdf
    • https://cdn.shopify.com/s/files/1/0433/3902/2494/files/bunoxitarade.pdf
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/30385823986.pdf
    • https://cdn.shopify.com/s/files/1/0440/3150/8645/files/536081980.pdf
    • https://cdn.shopify.com/s/files/1/0434/1510/9794/files/zettai_karen_children_the_unlimited.pdf
    • https://cdn.shopify.com/s/files/1/0437/3744/8609/files/20248533453.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9798/files/35908350000.pdf
    • https://cdn.shopify.com/s/files/1/0436/2190/8640/files/82506268964.pdf
    • https://cdn.shopify.com/s/files/1/0431/1806/7866/files/37858223397.pdf
    • https://cdn.shopify.com/s/files/1/0431/1403/7409/files/32158347495.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7742/files/86757002004.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_off00006540.bin
e3478fdb990e2260284112eb814332598fa7aa2d822c246a60b24240a881ceca
pdf-font-stream PDF embedded font (sfnt) at offset 0x6540 5132 bytes
font_01_sfnt_off000076c1.bin
6a34be2d578767cf9ba41e7a16f5fb25b03808b5658ebf8634971809f8881dcb
pdf-font-stream PDF embedded font (sfnt) at offset 0x76C1 14252 bytes