Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa8f1b979d62c2e…

MALICIOUS

PDF

40.7 KB Created: 2020-08-02 22:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 218377f489e992c7e9167783ba511a90 SHA-1: 5deea3861c0ea4ddc54ca1d3232166e9ec818f9c SHA-256: 8fa8f1b979d62c2eec922725de406af43053159fc58be3b4a27e4a0efe04b515
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to a malicious URL, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to a 'Dbpower projector manual' and the malicious URL. The PDF_SEO_LINK_FARM heuristic suggests the PDF is part of a larger link farm, likely for SEO manipulation or to host multiple malicious links. The ML_NYX_PDF_MALICIOUS classifier strongly indicates malicious intent.

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.com/pify?keyword=dbpower+projector+manual
    • http://files.tannerpestcontrol.com/uploads/1/3/0/7/130776728/riboferexem_xolerojoke.pdf
    • http://files.sanpedroleasing.com/uploads/1/3/1/6/131636890/402283.pdf
    • http://files.in2improv.org/uploads/1/3/0/9/130969910/kojuwodela.pdf
    • http://files.cpostpc.com/uploads/1/3/2/6/132681438/wibunepedupupo-tufedarufajigu-dazudijemazod-beboregugago.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fulefevizurosojasi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/64877690333.pdf
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/19713689982.pdf
    • https://cdn.shopify.com/s/files/1/0430/5040/1943/files/turovavoxetukazun.pdf
    • https://cdn.shopify.com/s/files/1/0429/3555/0119/files/92806275029.pdf
    • https://cdn.shopify.com/s/files/1/0432/5277/7128/files/32590528420.pdf
    • https://cdn.shopify.com/s/files/1/0431/4333/2000/files/gusavakukugutevukifukige.pdf
    • https://cdn.shopify.com/s/files/1/0430/6049/4490/files/golavorov.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8073/files/10917070394.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6423/files/misojab.pdf
    • https://cdn.shopify.com/s/files/1/0430/1458/6521/files/tirerolamuledajar.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_off000061bc.bin
389e9765b698840d059aebfbf28855657a995d43b6c2be3fe57be5f28e99cc7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x61BC 5208 bytes
font_01_sfnt_off00007371.bin
3ff6136488f4878cad9c60fde88d350db8e62647826b9509102f81748724015a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7371 10208 bytes