Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff0645d3802d143…

MALICIOUS

PDF

40.4 KB Created: 2020-08-23 23:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 773493488ea482e7ec2fc4fc53e3dff7 SHA-1: 4fbd23fbe5a98cecb5ebd1e10e0e04c23a42b101 SHA-256: bff0645d3802d14340e6d7089ddf86f1024f106bfa9bf5e5948ab99ff626152f
120 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One prominent link, 'https://ttraff.ru/pify?keyword=adverbs+worksheet+for+class+3+pdf', is identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to an 'adverbs worksheet for class 3 pdf'. This indicates a social engineering attack aiming to redirect users to malicious infrastructure.

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/pify?keyword=adverbs+worksheet+for+class+3+pdf
    • http://deweduneg.loopingtheloopfestival.org.uk/uploads/1/3/1/4/131406686/rerasimu.pdf
    • http://files.curetypeone.com/uploads/1/3/1/3/131380121/dadf492e7ec13e.pdf
    • http://vozofenap.yogawasi.com/uploads/1/3/1/3/131384403/romufude_nudasek_fekeluwuwugu_ropipasinag.pdf
    • http://files.barbaralyons.net/uploads/1/3/1/1/131164114/7040810.pdf
    • http://sivebar.felixjarrarmusic.com/uploads/1/3/0/9/130969742/ninevelule.pdf
    • https://cdn.shopify.com/s/files/1/0435/4480/5525/files/fubejojop.pdf
    • https://cdn.shopify.com/s/files/1/0431/3779/4204/files/655610115.pdf
    • https://cdn.shopify.com/s/files/1/0429/6887/5157/files/23895277153.pdf
    • https://cdn.shopify.com/s/files/1/0447/0718/4793/files/favivesotuj.pdf
    • https://cdn.shopify.com/s/files/1/0432/9432/6949/files/95240390688.pdf
    • https://cdn.shopify.com/s/files/1/0430/1992/7713/files/zaserona.pdf
    • https://cdn.shopify.com/s/files/1/0433/1870/6331/files/functional_analysis_mdu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8017/9100/files/vidoxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5314/files/tascam_dp-_006_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/6472/9512/files/15612465766.pdf
    • https://cdn.shopify.com/s/files/1/0428/3331/3958/files/reporter_definition_government.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_off00005f0d.bin
305ff27c3b735f7740b3d3989386fb8ae84f0ac0010d23d251851dbd9217633e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F0D 5752 bytes
font_01_sfnt_off000072ad.bin
dc3d4c3c99cbed375f5964b16c0f443c34e4a1e9c20bb6d91c6315d4e6a69ffb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72AD 10008 bytes

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