Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e6adef91694899b…

MALICIOUS

PDF

43.4 KB Created: 2020-08-08 11:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0256730fbfffd4120f688219242aaee SHA-1: 8a87ccf7ac0080769f6ec2c3fffbaf936470e2eb SHA-256: 3e6adef91694899bab12cb1a36954fa1bbca3dc219cfc0b59d223be94dea3d3a
160 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to Shopify domains, but one critical link redirects to a known malicious infrastructure. The document body, though heavily obfuscated, contains text related to 'ibps clerk books pdf free download' and the malicious redirector URL, suggesting a lure for exam preparation materials. The presence of a 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates that the document likely instructs the user to open a password-protected archive, a common tactic to bypass security scanning. The primary malicious IOC is the redirector URL, which likely leads to further stages of the attack.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=ibps+clerk+books+pdf+free+download
    • http://files.localumass.com/uploads/1/3/0/7/130739060/lobopofosigek_jevajofe_sirovowewuban.pdf
    • http://files.andieileenphotography.com/uploads/1/3/2/6/132695457/sexeser_winaxisivozev_pumibig_getese.pdf
    • http://files.ots-adventures.com/uploads/1/3/0/7/130740533/6754330.pdf
    • http://bakufira.rare-prints.com/uploads/1/3/2/7/132710797/xomiza-bawijemoful.pdf
    • http://zazumijum.topsailpwds.com/uploads/1/3/1/6/131607131/0fdfda9.pdf
    • https://cdn.shopify.com/s/files/1/0434/9601/3990/files/20394660665.pdf
    • https://cdn.shopify.com/s/files/1/0429/3771/2806/files/sistematika_makalah.pdf
    • https://cdn.shopify.com/s/files/1/0429/0517/4179/files/criteria_for_judging_dance_contest.pdf
    • https://cdn.shopify.com/s/files/1/0429/5802/8959/files/12306908273.pdf
    • https://cdn.shopify.com/s/files/1/0429/5832/3865/files/sidub.pdf
    • https://cdn.shopify.com/s/files/1/0431/2465/4241/files/78648494826.pdf
    • https://cdn.shopify.com/s/files/1/0431/0925/3282/files/wogemukovuzokiridete.pdf
    • https://cdn.shopify.com/s/files/1/0437/5219/4202/files/atmega8535_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/3863/8241/files/nexadikonibelinanis.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5621/files/20600227644.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/25590431420.pdf
    • https://cdn.shopify.com/s/files/1/0439/0633/4888/files/68249071875.pdf
    • https://cdn.shopify.com/s/files/1/0431/6453/2900/files/24707064468.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_off00006926.bin
e2f00027301fc462d01222324f9adb06b49958b8cd0ccee91d42ea2a63cd3cbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6926 5380 bytes
font_01_sfnt_off00007b8c.bin
a6a8ef9af1d7c00d67860c05e186a99991d7715c0c7372a80148d1b272be91dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B8C 10380 bytes

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