Malicious PDF — malware analysis report

Static analysis result for SHA-256 1575400722964d5f…

MALICIOUS

PDF

42.7 KB Created: 2020-08-05 16:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2b559f2a5e9e02275c5ab20eaee0fbc SHA-1: 7095037cad7516175c6ded865ac7feb4145386dd SHA-256: 1575400722964d5f21384fd6aabd7d845ca031eea14a88cacc808af5f946d12d
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed to generate traffic. One prominent URL, 'https://ttraff.cc/wb?keyword=generate%20pdf%20from%20html%20android', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting a social engineering lure to drive traffic to malicious infrastructure. No scripts were extracted, but the heuristic firings strongly indicate malicious redirection and link farming behavior.

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.cc/wb?keyword=generate%20pdf%20from%20html%20android
    • http://files.theatreartspt.com/uploads/1/3/1/4/131438641/zaluzunudapinenegip.pdf
    • http://files.lasvegasspacover.com/uploads/1/3/1/3/131380263/8eac6a03.pdf
    • http://files.duncanjefferson.com/uploads/1/3/2/6/132696512/9844496.pdf
    • http://files.tomandcath.com/uploads/1/3/2/6/132695273/kiginuvajafavux_mopusupokomas_nesixajuriso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2313/0009/files/91977575701.pdf
    • https://cdn.shopify.com/s/files/1/0437/8561/7570/files/averroes_search.pdf
    • https://cdn.shopify.com/s/files/1/0431/1695/3767/files/honda_pressure_washer_costco.pdf
    • https://cdn.shopify.com/s/files/1/0430/7176/6690/files/61939774440.pdf
    • https://cdn.shopify.com/s/files/1/0433/0805/6740/files/7986841826.pdf
    • https://cdn.shopify.com/s/files/1/0436/2957/6352/files/29160832074.pdf
    • https://cdn.shopify.com/s/files/1/0434/1117/7626/files/aronson_social_psychology_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/5253/1869/files/sasipawopinesimuwoxunu.pdf
    • https://cdn.shopify.com/s/files/1/0438/4302/7104/files/kaloluvamitifo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0132/3420/files/ragamegenaxa.pdf
    • https://cdn.shopify.com/s/files/1/0436/2820/0096/files/85937169985.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71340125447.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91146339154.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_off000068ad.bin
314683a3a538f82bca462185fd77f31e2962e2932ab884fc19defbb7535bef30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68AD 5136 bytes
font_01_sfnt_off000079fb.bin
aa8b7883e78160ed99e815508fd3bb02d54e2462e4f0fbf932a93c6af94e7a6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79FB 10512 bytes

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