Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b4021ba40b37b3…

MALICIOUS

PDF

44.9 KB Created: 2020-07-08 17:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fad1649db8a5d4f82b359426ba8378e8 SHA-1: 5b67e143cf8573e0162656e6f6b688e175d63277 SHA-256: a0b4021ba40b37b353814f758e58e9eb2fa44c31baf4e84ed7e6f6bcfe3cbbdf
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm for SEO manipulation or malware distribution. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.ru/wb?keyword=tp-link%20tl-wr1043nd%20manual%20sk`. The document body also contains this URL and mentions 'Tp-link tl-wr1043nd manual sk', indicating a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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=tp-link%20tl-wr1043nd%20manual%20sk
    • http://files.bookcellarlwonline.com/uploads/1/3/1/8/131860787/xejapami.pdf
    • http://files.willowwildedges.com/uploads/1/3/1/8/131856443/xukopiwome-tojazelapiz-kasivezobisu-sunezurawuse.pdf
    • http://files.stitchedwithcare.com/uploads/1/3/1/3/131383624/dowumi-wefudazebukop-wivavin-tajewowe.pdf
    • http://files.wormfoodforthough.net/uploads/1/3/0/9/130969243/e9c22e71c4f8.pdf
    • http://files.wilsonfarmmurfreesboro.com/uploads/1/3/2/8/132815752/pojusojizuruban_nexitumosi_tewof_pisobuvivigure.pdf
    • http://files.biophysical-ecology.com/uploads/1/3/1/4/131406356/xivut_girusidusowele_finusagon.pdf
    • http://files.foreverrockcandles.com/uploads/1/3/0/7/130776370/puzewo.pdf
    • http://files.tonypalermolifecoach.com/uploads/1/3/1/4/131437740/eaf0f757.pdf
    • https://zawamibidixa.files.wordpress.com/2020/06/97436721577.pdf
    • https://munamipatex.files.wordpress.com/2020/06/pupone.pdf
    • https://tafibenula.files.wordpress.com/2020/06/noxijozufuzuzugoj.pdf
    • https://gugujiwir.files.wordpress.com/2020/07/nifalipupakorukejo.pdf
    • https://pimenop.files.wordpress.com/2020/06/30523242153.pdf
    • https://tokatoxosi.files.wordpress.com/2020/06/rabogobafapabufito.pdf
    • https://narebifene.files.wordpress.com/2020/07/15232600144.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/79265304831.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rasamonuje.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xigidewepiwunabifaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fuwemosuwizukuxitakalav.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejupabofutub.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_off00006805.bin
8bfc3afcb75f163bfe3126c21b3c57ba4508a281f8c15b12fd3fdc348051c959		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6805 5340 bytes
font_01_sfnt_off00007a1b.bin
d9a2cb779f4aa3449617bd873bc4e45b49f72d52ef90b380fd6111830e67eced		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A1B 14308 bytes

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