Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bbd6312c59b821c…

MALICIOUS

PDF

34.3 KB Created: 2020-08-07 02:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fad1033184e9ab5e68e21692b6eb7f60 SHA-1: 489a8a3bbe0018d976b93cad7e141aa7f7c75eb0 SHA-256: 7bbd6312c59b821c5cfc8f801000eec3e9898f96387fe37d18fe363c2d1983c4
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to domains associated with link farms and redirectors, including the primary malicious URL https://ttraff.ru/pify?keyword=d+d+5e+character+sheet+adventurers+league+pdf. The document body, though heavily obfuscated, contains text related to Dungeons & Dragons 5e character sheets, suggesting a lure to entice users to click the malicious links. The ML classifier strongly indicated maliciousness.

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=d+d+5e+character+sheet+adventurers+league+pdf
    • http://files.bywayfinearts.com/uploads/1/3/1/4/131437074/totatunofoletu_zidufasureb_gibum.pdf
    • http://files.ratt-ru.org/uploads/1/3/1/8/131871494/litasuwadefaliv.pdf
    • http://files.ncscammers.com/uploads/1/3/0/7/130775484/gubuvepe.pdf
    • http://files.littlelotuscafe.com/uploads/1/3/0/7/130775145/f889c0.pdf
    • http://files.crestwoodbaptist.com/uploads/1/3/1/3/131382841/762961ab3a.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/pex_permissions_example.pdf
    • https://cdn.shopify.com/s/files/1/0428/3337/9484/files/jiterofulasukaxibopepepe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9467339244.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/91425490180.pdf
    • https://cdn.shopify.com/s/files/1/0436/9884/7894/files/59880566503.pdf
    • https://cdn.shopify.com/s/files/1/0428/5808/6559/files/pilobefine.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zodotuxufaliga.pdf
    • https://cdn.shopify.com/s/files/1/0438/1710/7616/files/gexomowe.pdf
    • https://cdn.shopify.com/s/files/1/0430/0426/4601/files/kupafus.pdf
    • https://cdn.shopify.com/s/files/1/0432/9137/7828/files/lonomujoxufepazo.pdf
    • https://cdn.shopify.com/s/files/1/0428/0814/8127/files/jibogapawanexep.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_off000045e2.bin
b87c015326a9e999d2ecacff40b69b17b8875c7ae6db602a3366a88f9abef9c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x45E2 5600 bytes
font_01_sfnt_off000058fc.bin
31eecd8d9c6c1a21e230683317d95088f4639ee2b826029c8b00bc5450740470
pdf-font-stream PDF embedded font (sfnt) at offset 0x58FC 10332 bytes