Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f3d5c84af279660…

MALICIOUS

PDF

49.6 KB Created: 2020-08-27 13:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d69b41ab2d8d12cd8d5fa5711215f241 SHA-1: 49ebffe75461bb4b5568279bd7cd275aa5a30f7f SHA-256: 2f3d5c84af2796607dae9f80777011810dfb8277bff07e9e1f615ebe56bfef28
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.com/pify?keyword=ejercicios+resueltos+vectores+1+bach, which is also listed as a malicious redirector. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded links, many pointing to shopify.com domains, likely to obscure the malicious destination.

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=ejercicios+resueltos+vectores+1+bach
    • http://files.concernedcitizensohio.org/uploads/1/3/0/7/130739117/vekaraz.pdf
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/ipad_replacement_screen.pdf
    • https://cdn.shopify.com/s/files/1/0439/7613/0718/files/antisocial_personality_disorder_etiology.pdf
    • https://cdn.shopify.com/s/files/1/0432/3062/5950/files/14388238464.pdf
    • https://cdn.shopify.com/s/files/1/0432/2882/3719/files/99642325978.pdf
    • https://cdn.shopify.com/s/files/1/0430/7730/4484/files/bewatakoruw.pdf
    • https://cdn.shopify.com/s/files/1/0432/5294/0968/files/72283904705.pdf
    • https://cdn.shopify.com/s/files/1/0433/2909/3800/files/storm_in_a_teacup.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/peregomosurexezobosezob.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12339474235.pdf
    • https://cdn.shopify.com/s/files/1/0432/1250/5243/files/30347514982.pdf
    • https://cdn.shopify.com/s/files/1/0430/9529/4109/files/acreditao_hospitalar_2020.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fda.bin
a13b9cf527071c121106ac215874d2fd10e031b37e19b0c6212027869d31feaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDA 4948 bytes
font_01_sfnt_off000070d1.bin
871cc2436d11cdd408c84c8c547cfff1d7aa6c13ab67079b8efab2c9eba420b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70D1 10864 bytes
font_02_sfnt_off000094db.bin
cf22935652bf473b7b88b7b88b8cd00700d9bd1e6d2ee22f9e6d6f4970431932		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94DB 16068 bytes
font_03_sfnt_off0000a979.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA979 4324 bytes

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