Malicious PDF — malware analysis report

Static analysis result for SHA-256 57656db24da2b4fe…

MALICIOUS

PDF

103.2 KB Created: 2020-07-26 13:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7b5216a17eccab0223e4e005fc18053 SHA-1: 7948d4190e823de53764b704626ecd914bbe00e4 SHA-256: 57656db24da2b4feb8983b4eb0cd3a2e0b81729070f0ff92723482f225ce5a00
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with at least one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be largely obfuscated or corrupted, but the presence of a redirector URL and a link farm suggests a phishing or malicious content delivery 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/pify?keyword=milestone+synonym+formal
    • http://files.avocadomama.com/uploads/1/3/1/4/131437283/3770469.pdf
    • http://files.jamesmatthewwilson.com/uploads/1/3/1/6/131637057/d1e23bb.pdf
    • http://files.downundermigration.com/uploads/1/3/1/8/131871864/zukategulisozixago.pdf
    • http://files.kuikbox.com/uploads/1/3/2/6/132696016/towataju.pdf
    • https://cdn.shopify.com/s/files/1/0435/8314/4093/files/8000247425.pdf
    • https://cdn.shopify.com/s/files/1/0433/2208/1448/files/31894176577.pdf
    • https://cdn.shopify.com/s/files/1/0434/7851/5864/files/torubewafolixa.pdf
    • https://cdn.shopify.com/s/files/1/0432/2423/6199/files/vemejadad.pdf
    • https://cdn.shopify.com/s/files/1/0432/3776/9383/files/vowotukamuxovoxo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3934/2248/files/vipevonelizekigabopukis.pdf
    • https://cdn.shopify.com/s/files/1/0435/1708/3803/files/pidemujoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/82108166650.pdf
    • https://cdn.shopify.com/s/files/1/0427/6987/5111/files/gedukuxegituvakuzofi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/wogolivonilegibawojalox.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/damegadunuje.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001449d.bin
a4ab329a4b7a7311b42cd405eb4cd65c38bb58f22f39eb9d63b122d524eab3a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1449D 4808 bytes
font_01_sfnt_off000154d6.bin
5786cccc6e8f52c951dd8decd5f0b160661a5464137f90b150b7111dba586174
pdf-font-stream PDF embedded font (sfnt) at offset 0x154D6 10828 bytes
font_02_sfnt_off00017945.bin
e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6
pdf-font-stream PDF embedded font (sfnt) at offset 0x17945 16164 bytes