Malicious PDF — malware analysis report

Static analysis result for SHA-256 547c485191dfccb0…

MALICIOUS

PDF

43.1 KB Created: 2020-07-10 07:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3a7e73a917c392d099c79fd7d37660b SHA-1: 0325fbe1506eec31eba94b70a34a6eaddc8bbdf7 SHA-256: 547c485191dfccb0eddc7bc6818f79df882e6343dff5a3a7310d2637c34d9c7f
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including a redirector to ttraff.com, which is flagged as malicious. The document body, though partially corrupted, suggests a lure related to 'auditoria de recursos humanos' (human resources audit). The presence of a large number of external PDF links, many with numeric slugs, indicates a link farm designed to drive traffic to potentially malicious sites.

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/wb?keyword=pdf%20auditoria%20de%20recursos%20humanos
    • http://files.jeffreyholton.net/uploads/1/3/1/4/131437275/1cae2c859fe86.pdf
    • http://files.onstagetheatricalproductions.com/uploads/1/3/2/7/132740870/9747311.pdf
    • http://files.vitadivagabondare.com/uploads/1/3/1/6/131606864/wutumu.pdf
    • http://files.whitegallowaysofwayby.com/uploads/1/3/0/8/130873907/fewubogukobavel-sixomolimu-mifip.pdf
    • http://files.romemta.com/uploads/1/3/2/8/132815175/guzulugizoxupilaruz.pdf
    • http://files.islandgirlislamorada.com/uploads/1/3/2/6/132696330/8629740.pdf
    • http://files.crownsofgloryw1gs.com/uploads/1/3/1/4/131438819/48e08a2d0de070.pdf
    • http://files.vesalius-continuum.com/uploads/1/3/1/3/131398234/munasajegobemuzuz.pdf
    • http://files.jayceevw.com/uploads/1/3/1/0/131070045/8b1a118.pdf
    • http://files.hub911.com/uploads/1/3/2/7/132712323/1528192.pdf
    • http://files.beyondthegap.org/uploads/1/3/0/7/130739658/samitimizovanisel.pdf
    • https://vogupiboje.files.wordpress.com/2020/06/73433397673.pdf
    • https://dimepixexam920921294.files.wordpress.com/2020/06/rinozadawilogovawigaw.pdf
    • https://jagepoxuro.files.wordpress.com/2020/06/japegasufejuji.pdf
    • https://dugazide.files.wordpress.com/2020/06/93423212453.pdf
    • https://vuxatuwubi.files.wordpress.com/2020/06/dakipudodesiti.pdf
    • https://jugubunerivo.files.wordpress.com/2020/07/fojonomaxijejesajego.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fakuwonilojovaxibudebu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vakijuxek.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/girotimovu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30611133668.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_off00006822.bin
2cdd329306b3aa824a6cb38b5ea0d62bda27b41546645af4b06eedfa5916ca1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6822 5112 bytes
font_01_sfnt_off00007951.bin
85a834d52d36d3241ccc4dbb5584a5c3a2b9dd5eb07d21a8e0c01c804c4e1ba1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7951 11196 bytes

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