Malicious PDF — malware analysis report

Static analysis result for SHA-256 198ad47481c24ac8…

MALICIOUS

PDF

41.2 KB Created: 2020-08-09 22:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b050b4679ba3162ce49af710e8ca79db SHA-1: 1de29dbc5a4530d413f80004f1a140773fce9f25 SHA-256: 198ad47481c24ac84d9ccc45cfcb45785651c263db9af0fe915a455c9af474fa
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one to a known malicious redirector, suggesting an attempt to lead the user to malicious content. The heuristic firings indicate the PDF is designed as a link farm, likely to manipulate search engine results or distribute malware. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious workflow.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=pdf+tool+split+pages
    • http://files.jemun.net/uploads/1/3/1/4/131437538/zimef-pafitakimu-kazuwapofi-xefulogekasa.pdf
    • http://files.jeffgoldsteinattuner.com/uploads/1/3/1/3/131398279/f9bbcf2eca63b6.pdf
    • http://morel.grandprixdrivingschool.net/uploads/1/3/0/8/130814328/7d6be92776.pdf
    • http://files.diversejewellers.com/uploads/1/3/2/6/132682806/zurogerigenevazalis.pdf
    • http://jufusexab.elilanguagemagazines.com/uploads/1/3/1/0/131070767/nujadotoramul.pdf
    • http://www.fotolia.com''gt;Fotolia.com/a'gt
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/8213/0332/files/the_show_goes_on_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0449/2269/9943/files/anemia_who.pdf
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/personal_voicemail_greeting_examples_for_cell_phone.pdf
    • https://cdn.shopify.com/s/files/1/0429/6284/5859/files/tuxazutuxupaxopefe.pdf
    • https://cdn.shopify.com/s/files/1/0435/7403/4600/files/49077535449.pdf
    • https://cdn.shopify.com/s/files/1/0431/1393/9110/files/92104363941.pdf
    • https://cdn.shopify.com/s/files/1/0432/5736/4638/files/84473383807.pdf
    • https://cdn.shopify.com/s/files/1/0428/9619/5737/files/jovorurog.pdf
    • https://cdn.shopify.com/s/files/1/0448/4697/3088/files/uses_of_atomic_absorption_spectroscopy.pdf
    • https://cdn.shopify.com/s/files/1/0434/6727/6454/files/69347909659.pdf
    • https://cdn.shopify.com/s/files/1/0433/6189/4565/files/idioms_and_phrases_with_tamil_meanings_and_examples.pdf
    • https://cdn.shopify.com/s/files/1/0432/4586/3067/files/besoin_en_fond_de_roulement_calcul.pdf
    • http://www.fotolia.com
    • 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_off000064d5.bin
e39c8de43b463c5501b8a55622873e55e7e85625e355acef4e55ee374b812831		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64D5 5112 bytes
font_01_sfnt_off0000765b.bin
e3853a8b851bf74c06a80e05a2247baafc5c62110076cad7a5119072637148af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x765B 9832 bytes

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