Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7856f632db99627…

MALICIOUS

PDF

44.3 KB Created: 2020-08-25 00:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ef5eb56cd34fc4b156a02e60c73474b SHA-1: 86c1223b44d027d0de751fa089b0e75702f6a1cf SHA-256: b7856f632db99627cbbdb3a5f36b21a4f03e908ce4a1a49d58d7b08535ebc7b0
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content broadly.

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=grammar+worksheets+for+esl+learners
    • http://tobom.thejournalofpolitics.org/uploads/1/3/1/6/131606289/5862370.pdf
    • http://files.startimepatisserie.com/uploads/1/3/1/6/131606046/rosufiwu.pdf
    • http://mojabuz.landscapegardenerscamberley.co.uk/uploads/1/3/1/4/131483245/lebajojom.pdf
    • http://nemigat.atelier-do.com/uploads/1/3/1/3/131398091/sesojamudab.pdf
    • https://cdn.shopify.com/s/files/1/0438/6373/6485/files/tazada.pdf
    • https://cdn.shopify.com/s/files/1/0434/8595/4198/files/xexugipesufemug.pdf
    • https://cdn.shopify.com/s/files/1/0431/9903/7595/files/fusese.pdf
    • https://cdn.shopify.com/s/files/1/0431/6656/4507/files/nikafumiluvizu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7955/6504/files/stay_rihanna_piano.pdf
    • https://cdn.shopify.com/s/files/1/0438/4368/2469/files/susupovezukam.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7311/files/41491044487.pdf
    • https://cdn.shopify.com/s/files/1/0433/5173/6471/files/korean_english_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0440/2964/0854/files/91423364767.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_off0000706a.bin
a7b02c992c25cf1f0657fe2dc31d93be727f5d5785be9211ef9e70fbde037d54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x706A 5192 bytes
font_01_sfnt_off0000820a.bin
380b3cbcc13a3e2c5336ac6f552b9dcb6a57deb8c318b8b1bc153164943d5b54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x820A 10060 bytes

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