Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c4d3b86c55bb7a…

MALICIOUS

PDF

67.3 KB Created: 2020-08-07 23:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77d8c77180f948505f08bd1c4492e588 SHA-1: 6b8cabc4ec29334bcb28377a928b3bdd6a8a4314 SHA-256: 91c4d3b86c55bb7a3799aac440a3989060ca73112d2a1b90b54ac6249cf05596
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a mass of external links, including a critical link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=cbt+worksheet+for+anxiety+pdf'. The document body, though heavily obfuscated, contains text suggesting it is a 'CBT worksheet for anxiety pdf', likely a lure to encourage clicks on the malicious link. The presence of numerous Shopify-hosted PDF links suggests a link farm for SEO poisoning or traffic generation to the primary malicious URL.

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=cbt+worksheet+for+anxiety+pdf
    • http://files.smarterartschool.com/uploads/1/3/2/6/132681771/bc7426d.pdf
    • http://files.whilewaitingblog.com/uploads/1/3/2/6/132695668/segezaf-puzenawo-vemovupaliligif-salid.pdf
    • http://files.hislove4us.com/uploads/1/3/1/4/131408788/depapeba-xewipel-sapiwodiju-tikefitimovalig.pdf
    • http://files.farmacybotanical.com/uploads/1/3/2/3/132302973/xutitogesafa-lixoreriberexik-larowuwonubola.pdf
    • https://cdn.shopify.com/s/files/1/0431/2091/8679/files/47883569140.pdf
    • https://cdn.shopify.com/s/files/1/0437/8158/7093/files/gizizatujasebuf.pdf
    • https://cdn.shopify.com/s/files/1/0430/9549/0721/files/xefuwamadosude.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/pofelefukifurulajawujetu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1931/files/68577512045.pdf
    • https://cdn.shopify.com/s/files/1/0431/8930/5506/files/5e_challenge_rating_to_level.pdf
    • https://cdn.shopify.com/s/files/1/0434/7707/4077/files/psychology_tamil_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0590/1991/files/86666525000.pdf
    • https://cdn.shopify.com/s/files/1/0429/4639/6326/files/ark_dino_stat_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0435/5401/3336/files/suputaralifakul.pdf
    • https://cdn.shopify.com/s/files/1/0431/0145/4500/files/benzene_toxicity.pdf
    • https://cdn.shopify.com/s/files/1/0430/8942/8637/files/52617276496.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbdf.bin
1c8f68a94d650ab60fc552a98ccc3354a571ee4d9d81b958e8ca600b2d75eac0
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBDF 5376 bytes
font_01_sfnt_off0000ce36.bin
d257778caa54b2785d57dee46d469aba762e80274199ab0bf11b73c2294f8523
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE36 10516 bytes
font_02_sfnt_off0000f1d8.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D8 4324 bytes