Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d1427d047a3196a…

MALICIOUS

PDF

41.8 KB Created: 2020-08-01 02:40:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f7832d9a9bb12b587202d51955906cf SHA-1: 701311e2d4fbad7c781b8024ccc45b21b15473b1 SHA-256: 6d1427d047a3196a79ca2f7b9016d7b208e68b3fcc08ef37dc108ff5fcf0bf21
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, a technique often used for SEO poisoning or to obscure malicious redirects. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.cc'. The ML classifier strongly indicated maliciousness, supporting the conclusion that this document is part of a malicious campaign.

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.cc/pify?keyword=two+letter+scrabble+words
    • http://files.stevescustomtattoos.com/uploads/1/3/1/8/131871745/f392d08.pdf
    • http://files.bradrussellmusic.org/uploads/1/3/1/6/131637218/tidoguwosi_bosura_wotefopaxe.pdf
    • http://files.lecheminantbooks.com/uploads/1/3/1/8/131860938/49e51134f872f2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8697/1029/files/89473217738.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/jafotubigetadita.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/zedekukivezomegiropogep.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/47878122177.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7910/files/53073847066.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1031/files/58803738275.pdf
    • https://cdn.shopify.com/s/files/1/0430/4732/1751/files/1913256598.pdf
    • https://cdn.shopify.com/s/files/1/0430/8434/9591/files/6881982638.pdf
    • https://cdn.shopify.com/s/files/1/0430/5934/7618/files/94935172628.pdf
    • https://cdn.shopify.com/s/files/1/0433/4541/2261/files/gopixakagaxunowubiw.pdf
    • https://cdn.shopify.com/s/files/1/0436/9537/4489/files/python_ascii_animation.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000649f.bin
adb20487424d6250edcabb571aecda99421166d81307f50f3ccbd11339babe31
pdf-font-stream PDF embedded font (sfnt) at offset 0x649F 5116 bytes
font_01_sfnt_off00007620.bin
eb7403fea17286f63e2b88cd9ac201b2f6e8b97e564d71a7b6abea72a997f32e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7620 10684 bytes