Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac7b0100ff488f47…

MALICIOUS

PDF

59.6 KB Created: 2020-08-06 03:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6870fa7cf36026e511c59765caacfbf1 SHA-1: 291b2e9a722878d70db757b3930cefd491e6af77 SHA-256: ac7b0100ff488f473502a704b794c930be871c5fae51c2edf4c6a71e06474c16
128 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, a common tactic for SEO spam and phishing. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=convert+cdf+to+pdf+python'. Another heuristic flagged a large number of external PDF links, with the first being 'https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ximulomonarosaw.pdf', suggesting a link farm or distribution mechanism. The presence of a 'download button' lure further supports a malicious intent.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=convert+cdf+to+pdf+python
    • http://files.massyouthbuild.org/uploads/1/3/1/4/131453252/6165755.pdf
    • http://files.kindactswarmhearts.com/uploads/1/3/0/7/130775997/4774485.pdf
    • http://files.nationalconstructionsafetyexecutives.org/uploads/1/3/1/3/131379894/bakudajijina.pdf
    • http://files.careerhighschool.org/uploads/1/3/1/4/131407274/xazebo.pdf
    • http://files.nationalconstructionsafetyexecutives.org/uploads/1/3/1/3/131379894/ba
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ximulomonarosaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/5803/6889/files/pirekov.pdf
    • https://cdn.shopify.com/s/files/1/0435/5896/1315/files/10246609452.pdf
    • https://cdn.shopify.com/s/files/1/0428/3580/4319/files/74667309829.pdf
    • https://cdn.shopify.com/s/files/1/0428/1915/8183/files/fupiropamimadewenage.pdf
    • https://cdn.shopify.com/s/files/1/0427/5725/9420/files/20638066112.pdf
    • https://cdn.shopify.com/s/files/1/0427/8580/0358/files/belowisimexoxowa.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/letaxibefewulali.pdf
    • https://cdn.shopify.com/s/files/1/0438/1632/1184/files/dubinumisuwobera.pdf
    • https://cdn.shopify.com/s/files/1/0431/6512/2720/files/13002391830.pdf
    • https://cdn.shopify.com/s/files/1/0429/5258/9465/files/kedadojig.pdf
    • https://cdn.shopify.com/s/files/1/0437/6566/1853/files/acrobat_editor_free_download_for_windows_8.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_off0000ad4a.bin
5666c67edf6fe11c0be6b524759ee7e4bd6c0e64add8c525befe893252a6e93a
pdf-font-stream PDF embedded font (sfnt) at offset 0xAD4A 4888 bytes
font_01_sfnt_off0000bdfa.bin
a6d7ed76abb4f0c5660ce901c802dc44e29aceeef87ea0e5de6e3413c189fb0f
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDFA 10416 bytes