Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e105c1b5ea7b66…

MALICIOUS

PDF

45.5 KB Created: 2020-07-29 08:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a5195723f9fa616cac5450050eff1ec SHA-1: db3226106e4f2226911fae95d9dcef70286ce37f SHA-256: 65e105c1b5ea7b66625ccf77691747439c764f12f4ed59187125fd7d706c94d5
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a malicious redirector link that leads to a farm of other PDF files, likely as part of a phishing or malware distribution scheme. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs the user to download a password-protected archive, a common tactic to bypass security scanning. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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
  • 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.com/pify?keyword=winrar+full+32+bit
    • http://files.yellowmedicinereviewstore.com/uploads/1/3/0/9/130969831/e722210569.pdf
    • http://files.parkguitars.com/uploads/1/3/1/4/131438018/30c97.pdf
    • http://files.rubberdirect.net/uploads/1/3/1/4/131407227/malefunisiwekos.pdf
    • http://files.mountainvilleumc.com/uploads/1/3/1/3/131398188/dolemote.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7220/0608/files/dimadakaloladagepoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/4478/1735/files/wopuzalobovidizo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0128/2711/files/24591748607.pdf
    • https://cdn.shopify.com/s/files/1/0433/7516/5594/files/dixoketap.pdf
    • https://cdn.shopify.com/s/files/1/0428/0591/9903/files/89616592079.pdf
    • https://cdn.shopify.com/s/files/1/0435/3867/7924/files/voxenok.pdf
    • https://cdn.shopify.com/s/files/1/0438/3670/2870/files/kawanuredejipup.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/41537441182.pdf
    • https://cdn.shopify.com/s/files/1/0431/4628/1122/files/zosibilipawinizewef.pdf
    • https://cdn.shopify.com/s/files/1/0434/6455/6710/files/45561919326.pdf
    • https://cdn.shopify.com/s/files/1/0435/1829/6228/files/1660735192.pdf
    • https://cdn.shopify.com/s/files/1/0433/8126/0440/files/vubitosafabef.pdf
    • https://cdn.shopify.com/s/files/1/0428/2423/7212/files/10689302506.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_off0000755e.bin
31cd9e52ed18da52dbc5f20309ad9a065474838493a7c4bbc23d342840e531ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x755E 4688 bytes
font_01_sfnt_off00008551.bin
5b97f382700e53f89034b740abe90441a5a4a0676ee16eac22a8e053c1de9e52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8551 10608 bytes

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