Malicious PDF — malware analysis report

Static analysis result for SHA-256 deeb8091642631bd…

MALICIOUS

PDF

41.4 KB Created: 2020-07-09 01:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf33c74da96ee59e0ab3d2c0c71b9b09 SHA-1: a64d31a223d7ae1e24268a18799872eebe9c6109 SHA-256: deeb8091642631bde271d8981d52610984d359f91b597c3eec01a2b02df76c44
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which point to domains designed to mimic legitimate content, such as 'happiest baby guide to great sleep pdf'. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://ttraff.ru/wb?keyword=happiest%20baby%20guide%20to%20great%20sleep%20pdf'. The ML classifier also strongly flagged this PDF as malicious. These factors suggest the document is part of a link farm or phishing campaign.

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.ru/wb?keyword=happiest%20baby%20guide%20to%20great%20sleep%20pdf
    • http://files.andreanelson.studio/uploads/1/3/1/8/131871690/b02bc.pdf
    • http://files.supernaturalentertamitedproductions.org/uploads/1/3/1/4/131455883/visemomitowezij-fezaweku-xevut-kixivim.pdf
    • http://files.euphoriacalm.com/uploads/1/3/1/6/131636737/4772889.pdf
    • http://files.jessieanimation.com/uploads/1/3/2/6/132682565/731bda74c3cfb7a.pdf
    • http://files.mac-italy.com/uploads/1/3/1/4/131452953/ec156a2f6c.pdf
    • http://files.hhrstrategies.com/uploads/1/3/1/8/131871829/jetamonike-gekavukas-kuxesivi.pdf
    • https://lorabipuv.files.wordpress.com/2020/06/fotobejenadarasoxabajurit.pdf
    • https://xepijute.files.wordpress.com/2020/06/57696211076.pdf
    • https://dupalusojo.files.wordpress.com/2020/06/kipapujopiwisepij.pdf
    • https://rekisitop.files.wordpress.com/2020/06/60161874721.pdf
    • https://kikibok.files.wordpress.com/2020/07/divoxisogogewep.pdf
    • https://vuzenaw.files.wordpress.com/2020/06/pukuwefabijirelorod.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72593533024.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pelezegagujagemubejapo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51994241049.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/80804151078.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_off00006565.bin
25640d59c07789ea37f96506c72e00cb589b6e1f356a00a10a40613b261f8b34
pdf-font-stream PDF embedded font (sfnt) at offset 0x6565 5188 bytes
font_01_sfnt_off00007718.bin
95c8be3f4c9ca736f5466b07e5c4f80b53c6efb1880f552b976f17776fedaf43
pdf-font-stream PDF embedded font (sfnt) at offset 0x7718 9808 bytes