Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a15f20fd5efa25…

MALICIOUS

PDF

39.9 KB Created: 2020-08-26 18:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fa5cea648e9dcccf4619d5c99b9ff86 SHA-1: 7e2558f82ef850b6ef41bde38dbc1cb80d8cedc4 SHA-256: 85a15f20fd5efa25d3b44efa2a5d296334e36ef81003beb52234b6a9f672238e
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with 24 external PDF links identified. One of these links, 'https://ttraff.ru/pify?keyword=raja+endon+mastura+wedding+flowers', is flagged as a known malicious redirector. The presence of a large link farm and a malicious redirector suggests an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, and the document body is largely unreadable binary data.

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=raja+endon+mastura+wedding+flowers
    • http://files.lquertportfolio.com/uploads/1/3/2/7/132710756/5409682.pdf
    • https://cdn.shopify.com/s/files/1/0460/1633/1943/files/zenonia_4_leveling_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/9954/6009/files/44045365246.pdf
    • https://cdn.shopify.com/s/files/1/0431/5463/6966/files/muzasimufixatov.pdf
    • https://cdn.shopify.com/s/files/1/0435/3087/9136/files/boxorepik.pdf
    • https://cdn.shopify.com/s/files/1/0434/7166/7360/files/compulsory_voting_mini_q_document_g_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/0749/8647/files/jixawevotewigiwetuvoxe.pdf
    • https://cdn.shopify.com/s/files/1/0434/2503/8498/files/aromatic_hydrocarbons_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/4997/5959/files/xizurobuwa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27622062760.pdf
    • https://cdn.shopify.com/s/files/1/0434/0652/4566/files/33077575955.pdf
    • https://cdn.shopify.com/s/files/1/0428/5015/6700/files/anthya_bhangi_song.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_off00005535.bin
1c23c7b767951703b8b8b0dd3dd3e636f9fbcd632b4209d9d59982d5b6c6b0b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5535 5404 bytes
font_01_sfnt_off0000679b.bin
69e186864786b061597769fdfee35a629a5e9745f91b6b1fa354819a7251e547
pdf-font-stream PDF embedded font (sfnt) at offset 0x679B 13844 bytes