Malicious PDF — malware analysis report

Static analysis result for SHA-256 8487e22a4d25b5e1…

MALICIOUS

PDF

54.0 KB Created: 2020-08-06 10:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10d6b8abfcde37fa15f92645e6a4d1bd SHA-1: 21af4593bac81845a47ac619244db61fbb9cd0ac SHA-256: 8487e22a4d25b5e1565ae31c8e1e7ae4fde6266057c0bb3e09b64920638be44a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of embedded links, many of which point to a link farm designed to redirect users to malicious content. The primary malicious URL identified is https://ttraff.com/pify?keyword=cassandra+architecture+pdf, which is flagged as a known malicious redirector. The document body itself is heavily obfuscated but contains references to the malicious URL, suggesting an attempt to disguise the malicious intent. The presence of numerous links and the critical heuristic firing for a malicious redirector strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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=cassandra+architecture+pdf
    • http://files.heartofthewest.org/uploads/1/3/0/9/130969254/9116138.pdf
    • http://zejagi.candacewilkinson.com/uploads/1/3/1/4/131482976/rifum.pdf
    • http://files.togo4christ.com/uploads/1/3/1/3/131398097/2308972.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/6816/9121/files/54238510207.pdf
    • https://cdn.shopify.com/s/files/1/0434/7337/1288/files/87014550098.pdf
    • https://cdn.shopify.com/s/files/1/0436/0824/4381/files/how_to_refill_zippo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3685/9813/files/xetadabaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/1391/5303/files/65813644711.pdf
    • https://cdn.shopify.com/s/files/1/0433/1683/8558/files/kekakamifawekapor.pdf
    • https://cdn.shopify.com/s/files/1/0431/8330/8955/files/atomic_number_and_mass_of_elements.pdf
    • https://cdn.shopify.com/s/files/1/0429/3525/5203/files/3394159095.pdf
    • https://cdn.shopify.com/s/files/1/0431/8222/7617/files/sebogizomoluwunaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23281911610.pdf
    • https://cdn.shopify.com/s/files/1/0427/8150/7740/files/tinaximaditux.pdf
    • https://cdn.shopify.com/s/files/1/0430/7694/4033/files/seduloguvexunozugiwuw.pdf
    • https://cdn.shopify.com/s/files/1/0434/8670/7876/files/58374308759.pdf
    • https://cdn.shopify.com/s/files/1/0433/6048/5541/files/visozedozifuguwova.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_off0000970a.bin
78c6b03fd0ff3f244ee99fe7de88657d73f857bbafc940ce3c4fdde6b34e1902		 pdf-font-stream PDF embedded font (sfnt) at offset 0x970A 5116 bytes
font_01_sfnt_off0000a868.bin
acacff12ec0471e9dcc3f9897a875ea06e4b7d3004c52b8ce1ecc065b62c52a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA868 10180 bytes

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