Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd0fb393c9bce11…

MALICIOUS

PDF

46.9 KB Created: 2020-08-12 11:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15ab9e166befb10459d73cb36ac22cba SHA-1: 8fd1350a47182826735e1645648a0b8c5545e28c SHA-256: 4fd0fb393c9bce1124ecc14b3609ae0558334549062cbe5bb0391dc47d106063
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a link farm with numerous external PDF links, including a known malicious redirector. The primary malicious URL identified is https://ttraff.ru/pify?keyword=understanding+business+nickels+pdf. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious content. No scripts were extracted, limiting the analysis of specific execution behaviors.

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=understanding+business+nickels+pdf
    • http://files.vontoba.com/uploads/1/3/1/4/131438741/zipunux.pdf
    • http://tuvutogal.milanrotaryclub.com/uploads/1/3/0/7/130775189/2289788.pdf
    • http://files.threadstoinspire.com/uploads/1/3/0/7/130775980/faronijodegow_mopobufate_gadojegubikav.pdf
    • https://cdn.shopify.com/s/files/1/0428/5143/4652/files/cryptocurrency_for_dummies_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mosagewenusuwaguxizekud.pdf
    • https://cdn.shopify.com/s/files/1/0435/3848/1311/files/john_deere_2240_service_manual_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/2340/8036/files/pudob.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rodupenewizaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/5434/2042/files/bien_dit_french_2.pdf
    • https://cdn.shopify.com/s/files/1/0432/2535/0301/files/14395644878.pdf
    • https://cdn.shopify.com/s/files/1/0436/6227/8809/files/20195876309.pdf
    • https://cdn.shopify.com/s/files/1/0432/6716/2276/files/85989075609.pdf
    • https://cdn.shopify.com/s/files/1/0429/8450/5498/files/75295095545.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/35209966956.pdf
    • https://cdn.shopify.com/s/files/1/0435/1574/0312/files/classes_and_data_abstraction_in_c.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_off00006757.bin
1e8d9e8667a1daf97fd06db93f50af96ca1a289a9665f2a347ef87aa92477b79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6757 5288 bytes
font_01_sfnt_off0000795b.bin
66d8dd4169ee3b178be0c7c3bc529c0cafcb77130b8e6f769e3655749d403998		 pdf-font-stream PDF embedded font (sfnt) at offset 0x795B 11992 bytes
font_02_sfnt_off00009ff0.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FF0 4324 bytes

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