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) First seen: 2020-08-25
MD5: cf33c74da96ee59e0ab3d2c0c71b9b09 SHA-1: a64d31a223d7ae1e24268a18799872eebe9c6109 SHA-256: deeb8091642631bde271d8981d52610984d359f91b597c3eec01a2b02df76c44
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and flagged as malicious redirectors. The document body, though partially corrupted, includes a URL that appears to be a lure for a 'happiest baby guide to great sleep pdf', suggesting a phishing or scam pretext. The ML classifier strongly indicates maliciousness, and the structure points to a link farm designed to distribute malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 In PDF document text
    • http://files.andreanelson.studio/uploads/1/3/1/8/131871690/b02bc.pdfIn PDF document text
    • http://files.supernaturalentertamitedproductions.org/uploads/1/3/1/4/131455883/visemomitowezij-fezaweku-xevut-kixivim.pdfIn PDF document text
    • http://files.euphoriacalm.com/uploads/1/3/1/6/131636737/4772889.pdfIn PDF document text
    • http://files.jessieanimation.com/uploads/1/3/2/6/132682565/731bda74c3cfb7a.pdfIn PDF document text
    • http://files.mac-italy.com/uploads/1/3/1/4/131452953/ec156a2f6c.pdfIn PDF document text
    • http://files.hhrstrategies.com/uploads/1/3/1/8/131871829/jetamonike-gekavukas-kuxesivi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://lorabipuv.files.wordpress.com/2020/06/fotobejenadarasoxabajurit.pdfIn PDF document text
    • https://xepijute.files.wordpress.com/2020/06/57696211076.pdfIn PDF document text
    • https://dupalusojo.files.wordpress.com/2020/06/kipapujopiwisepij.pdfIn PDF document text
    • https://rekisitop.files.wordpress.com/2020/06/60161874721.pdfIn PDF document text
    • https://kikibok.files.wordpress.com/2020/07/divoxisogogewep.pdfIn PDF document text
    • https://vuzenaw.files.wordpress.com/2020/06/pukuwefabijirelorod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72593533024.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pelezegagujagemubejapo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51994241049.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/80804151078.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6565 5188 bytes
SHA-256: 25640d59c07789ea37f96506c72e00cb589b6e1f356a00a10a40613b261f8b34
font_01_sfnt_off00007718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7718 9808 bytes
SHA-256: 95c8be3f4c9ca736f5466b07e5c4f80b53c6efb1880f552b976f17776fedaf43