Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bfb084cce4ace81…

MALICIOUS

PDF

39.5 KB Created: 2020-09-01 02:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e7ec47f6add7e9e7349c0ba4fd76aaf SHA-1: 127d390a21a20da2c25ff08c880e6c0b943bfa8c SHA-256: 4bfb084cce4ace814c806cb77485384c5b1f9c3277e8ba799dc5a69a42e6e844
120 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to the presence of a large number of embedded links, a technique often used for SEO farms or to redirect users to malicious infrastructure. One of the primary links points to a known malicious redirector. While no scripts were extracted, the structure and heuristics strongly suggest a malicious intent to lure users through a link farm.

Heuristics 3

  • 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.
  • 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/wix?keyword=functions+of+nouns+in+a+sentence+pdf
    • https://cdn.shopify.com/s/files/1/0433/8227/6250/files/kumewagaxenir.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0726/files/zebis.pdf
    • https://cdn.shopify.com/s/files/1/0440/8960/6294/files/22885617459.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5023/files/pusuriwakurumafomo.pdf
    • https://cdn.shopify.com/s/files/1/0435/2681/5903/files/digital_advertising_insertion_order_template.pdf
    • https://static.usrfiles.com/ugd/6f58fb_832e451e2e06482596081f20a3c76263.pdf
    • https://static.usrfiles.com/ugd/ecec20_faa1a4b1d8ba494b98b33f6e4c70f57e.pdf
    • https://static.usrfiles.com/ugd/b5472a_c69de3e99096419db59fee7fe3d0b727.pdf
    • https://cdn.shopify.com/s/files/1/0431/8648/7455/files/pokemon_leaf_green_gameshark_codes.pdf
    • https://cdn.shopify.com/s/files/1/0433/4305/2953/files/93401574726.pdf
    • https://cdn.shopify.com/s/files/1/0431/5349/0071/files/ambedkar_song_tamil_video.pdf
    • https://cdn.shopify.com/s/files/1/0429/9050/2051/files/hcf_and_lcm_worksheets_for_grade_7.pdf
    • https://cdn.shopify.com/s/files/1/0437/1624/7703/files/25899276365.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_off00005d18.bin
51ba5f0e88143bdc2d922dddd3a7232c15075b5173eb5eae928fbe2740b2fbd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D18 4976 bytes
font_01_sfnt_off00006e28.bin
c3c26c0292d825d4a39d00ef9e21dbddd5122fe7c14b7c0caeb27f1cf99ac459		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E28 10244 bytes

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