Malicious PDF — malware analysis report

Static analysis result for SHA-256 5691b41b74b898ae…

MALICIOUS

PDF

56.4 KB Created: 2020-08-11 03:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23e31e9a7c3dcdcddaa649dea0549016 SHA-1: f7a81109eeedcbda63475a00a00a42c46810b990 SHA-256: 5691b41b74b898ae23d2ddefbe5d98743f7a93c68c8f05ec7f05c44118096300
154 Risk Score

Malware Insights

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

The PDF was flagged for containing malicious redirector links and a link farm, indicating a likely attempt to lure users to malicious sites. The primary malicious URL identified is ttraff.ru, which is used in conjunction with a keyword suggesting a lure related to a book chapter. The document body contains obfuscated text and a URL that mirrors the malicious redirector, reinforcing the attack pattern. No scripts were extracted, limiting the analysis of direct payload execution.

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=the+botany+of+desire+chapter+1+pdf
    • http://files.alankendallmusic.com/uploads/1/3/1/3/131383934/9047129.pdf
    • http://files.arco-vienna.at/uploads/1/3/2/6/132696174/5e9cb4412.pdf
    • http://files.oregonstateinvestmentgroup.com/uploads/1/3/1/4/131437295/somumaluwa.pdf
    • http://wifizarel.rgadesignquilts.com/uploads/1/3/1/4/131438216/zogupox-xoxitefejat-rudexonamudodat-liwezalidof.pdf
    • https://cdn.shopify.com/s/files/1/0430/7792/7063/files/23693338100.pdf
    • https://cdn.shopify.com/s/files/1/0437/1687/0293/files/aristofane_gli_uccelli.pdf
    • https://cdn.shopify.com/s/files/1/0428/2079/6583/files/volikukepuk.pdf
    • https://cdn.shopify.com/s/files/1/0434/5869/1232/files/vuzipo.pdf
    • https://cdn.shopify.com/s/files/1/0435/5381/6728/files/tejururibowexisonu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7232/3737/files/nasisuwavatodibafib.pdf
    • https://cdn.shopify.com/s/files/1/0433/8568/4124/files/african_ontology.pdf
    • https://cdn.shopify.com/s/files/1/0440/7951/3752/files/88252053369.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/88101905250.pdf
    • https://cdn.shopify.com/s/files/1/0431/2635/8173/files/20831889499.pdf
    • https://cdn.shopify.com/s/files/1/0435/1646/1211/files/91134870366.pdf
    • https://cdn.shopify.com/s/files/1/0430/4178/3959/files/15952111102.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2360/files/morris_mano_computer_architecture.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000910c.bin
070a77bb6fdfca07c9c93a67c6e7dbbc72cf05977139745d896841eac73a5c47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x910C 5240 bytes
font_01_sfnt_off0000a2d4.bin
5c90e7c52402113d30e6d248a06da45dcf00e5097e07c4802066ad2c70cbd51f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2D4 10288 bytes
font_02_sfnt_off0000c5f5.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F5 4324 bytes

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