Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33bc47aeaba6c64…

MALICIOUS

PDF

54.0 KB Created: 2020-07-29 12:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2507dbc2772e49cffaaf894f54522878 SHA-1: 6369cce15a989a4f42a115b727e255e24c81e20d SHA-256: c33bc47aeaba6c6418a4e98b2792b7618a577c4ee6f317beed62505828465dd8
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a "PDF SEO Link Farm" heuristic, with a primary malicious redirector at `ttraff.ru`. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be related to business plans, suggesting a lure to attract users to click on the malicious links.

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/pify?keyword=business+plan+meaning+pdf
    • http://files.hairbyminsun.com/uploads/1/3/0/7/130775465/4976804.pdf
    • http://files.bethadice.com/uploads/1/3/1/8/131871919/pinetopune-sowir.pdf
    • http://files.serenitythroughsound.com/uploads/1/3/2/7/132740408/gepil-kixet-pesajoxo.pdf
    • http://files.austinpianoschool.com/uploads/1/3/2/3/132302732/747092.pdf
    • http://files.au
    • https://cdn.shopify.com/s/files/1/0440/0034/6270/files/nokejolovadubafezixupexaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/8228/5216/files/dipuwux.pdf
    • https://cdn.shopify.com/s/files/1/0434/1350/4156/files/42870346171.pdf
    • https://cdn.shopify.com/s/files/1/0433/1431/5422/files/putin.pdf
    • https://cdn.shopify.com/s/files/1/0428/9432/7961/files/96582688078.pdf
    • https://cdn.shopify.com/s/files/1/0430/3549/2503/files/9376502656.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7913/files/59370386302.pdf
    • https://cdn.shopify.com/s/files/1/0430/3486/9921/files/87084879227.pdf
    • https://cdn.shopify.com/s/files/1/0427/6381/3020/files/54349851780.pdf
    • https://cdn.shopify.com/s/files/1/0428/2338/5247/files/sozivugivuwofomeji.pdf
    • https://cdn.shopify.com/s/files/1/0434/6213/1869/files/95018051146.pdf
    • https://cdn.shopify.com/s/files/1/0433/2807/7992/files/sijaxevinowofivujekusaso.pdf
    • https://cdn.shopify.com/s/files/1/0440/8557/5832/files/61121569276.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_off00009710.bin
0dacc6363a352b9a27e3c8606f70cae4bdeb09cb31c21d99da3a6fd2780dc97b
pdf-font-stream PDF embedded font (sfnt) at offset 0x9710 5004 bytes
font_01_sfnt_off0000a7f4.bin
51684032b25fe343edfa255a0ce5b74cc0727d95dfb0e25b7b7b3b1468c66d57
pdf-font-stream PDF embedded font (sfnt) at offset 0xA7F4 10188 bytes