Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd24b23ba3cc12f…

MALICIOUS

PDF

40.1 KB Created: 2020-08-20 12:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa0e3159e42c50df5ce1cdfebe359b5c SHA-1: 2b090a817e0a7af2350bb067d64c31d7e68b5714 SHA-256: 1bd24b23ba3cc12f30171e3119fce418ac8e1a74b3d77707e2c805251caceb59
128 Risk Score

Malware Insights

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

The PDF file contains a link farm and a specific malicious redirector URL. The document body, despite being heavily obfuscated, contains text related to 'free printable letter f coloring worksheets' and the malicious URL. The heuristic findings indicate the PDF links to known malicious redirector infrastructure and engages in SEO link farming, suggesting a lure to a malicious site. The presence of a 'download button' heuristic further supports a deceptive workflow.

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=free+printable+letter+f+coloring+worksheets
    • http://files.stevepomerantzeditorial.com/uploads/1/3/1/0/131070612/1021ab31.pdf
    • http://files.highheartcrystalhealing.com/uploads/1/3/2/7/132740692/gaxofiregavokur-vitifu-funibeso.pdf
    • http://juzofolo.thechurchofthelivinggod.com/uploads/1/3/1/4/131408024/purozomilem_xirebiwukomulo.pdf
    • http://peniwum.rylandhowardaudio.com/uploads/1/3/0/9/130969336/f925e91.pdf
    • https://cdn.shopify.com/s/files/1/0431/9982/4032/files/xemebipokuziwoluligovuvab.pdf
    • https://cdn.shopify.com/s/files/1/0460/1551/2735/files/fadigugolefunobajimil.pdf
    • https://cdn.shopify.com/s/files/1/0437/5016/2583/files/keto_diet_recipe.pdf
    • https://cdn.shopify.com/s/files/1/0432/4245/5195/files/rojutudojugewipaputuvol.pdf
    • https://cdn.shopify.com/s/files/1/0443/0177/9100/files/jusedekolopow.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/how_to_uninstall_git.pdf
    • https://cdn.shopify.com/s/files/1/0431/7344/5792/files/51423052942.pdf
    • https://cdn.shopify.com/s/files/1/0435/3340/2266/files/jesejenimidixemijugo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8934/7228/files/cts_exam_guide_second_edition.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_off00005b1e.bin
b0149c6181f53a1db1e9987a64a0fd239481a1824109b9b3e3ae63d825b46d8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B1E 5528 bytes
font_01_sfnt_off00006def.bin
7a3b47c96e658b1eb334b6726c9f13472d2bb2e4b361693d0dcc63bacb336eb4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DEF 11180 bytes