Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b757b70f9ac58b…

MALICIOUS

PDF

41.1 KB Created: 2020-08-21 12:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff4e16c25024415f07aa08e601c073cc SHA-1: 5c722a0a1b18bb45bd91f215a126e58d3b93f82a SHA-256: 28b757b70f9ac58b0c8c6a70d19fdbecf77999c5d6559104b219e62f21a27e53
120 Risk Score

Malware Insights

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

The PDF file contains a lure for "Adobe reader free for windows" and embeds a link to a known malicious redirector. This redirector then points to a PDF file hosted on a CDN. The heuristic firings indicate that the PDF is designed as a link farm and contains malicious redirector links, strongly suggesting a phishing or malware distribution attempt.

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.com/pify?keyword=adobe+reader++free+for+windows
    • http://files.carlsoncattlecompany.com/uploads/1/3/0/7/130775850/fb97064682.pdf
    • http://files.samcozzi.com/uploads/1/3/0/7/130739747/xituvaje.pdf
    • http://nefima.insightcounselingc.com/uploads/1/3/1/4/131454057/7989493.pdf
    • https://cdn.shopify.com/s/files/1/0429/8443/9971/files/kejegu.pdf
    • https://cdn.shopify.com/s/files/1/0437/9587/3949/files/scary_car_commercial.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/82977452153.pdf
    • https://cdn.shopify.com/s/files/1/0431/4313/5393/files/2020_lok_sabha_election_results_west_bengal.pdf
    • https://cdn.shopify.com/s/files/1/0445/4537/6420/files/elona_plus_wiki.pdf
    • https://cdn.shopify.com/s/files/1/0429/6795/7658/files/7397121198.pdf
    • https://cdn.shopify.com/s/files/1/0429/3486/1987/files/kuvajokepegi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4475/6901/files/xitizugepibarafituxetor.pdf
    • https://cdn.shopify.com/s/files/1/0449/1742/4283/files/vafimofodiminex.pdf
    • https://cdn.shopify.com/s/files/1/0437/7047/8746/files/lets_eat_2_cast.pdf
    • https://cdn.shopify.com/s/files/1/0433/6094/4286/files/accu_chek_performa.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/66472439596.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_off0000639c.bin
7671942497b1a63ff234bb0b81c80f09c565a6890f7cccb668b3fc6891f85096		 pdf-font-stream PDF embedded font (sfnt) at offset 0x639C 5088 bytes
font_01_sfnt_off00007508.bin
839b62c5c8c2ffbe8652dec68561b8884020d1266dc0d96373be0077574e644f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7508 10092 bytes

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