Malicious PDF — malware analysis report

Static analysis result for SHA-256 721c304f6fe8f5ab…

MALICIOUS

PDF

44.0 KB Created: 2020-08-22 19:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a90acb2fc7bdae9c490722df134cf77 SHA-1: 92a83359db849b5944129b6db99ca8d300d9f93e SHA-256: 721c304f6fe8f5abc0b54e1f15b4a7badd524853b746c4a5a33edc237d2e86f9
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to a link farm designed to host malicious content. One prominent link redirects to `https://ttraff.cc/pify?keyword=biological+causes+of+ptsd+pdf`, which is flagged as malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Biological causes of ptsd pdf', suggesting a lure to trick users into clicking the malicious links. The presence of many external links, including those to Shopify, indicates a potential SEO poisoning or link farm strategy to distribute malware.

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/pify?keyword=biological+causes+of+ptsd+pdf
    • http://wavox.milwaukeelostboulevards.com/uploads/1/3/1/6/131636974/jegosa.pdf
    • http://files.ov4h.com/uploads/1/3/1/6/131607131/xigakiregupep_nibinosoduriju_dupavanezogesu.pdf
    • http://files.sweetpeaangelz.com/uploads/1/3/2/7/132740892/e96a741f97.pdf
    • http://kuvariw.gunillalarsson.com/uploads/1/3/0/7/130775451/zipuxisax_pexobu_tafom_wupokere.pdf
    • http://files.fosteringforwardmi.org/uploads/1/3/0/8/130813988/xomebitegapugo_jinoko.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/5667/4469/files/astm_d638-_10_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/7431/3622/files/anne_of_green_gables_questions.pdf
    • https://cdn.shopify.com/s/files/1/0431/8828/9694/files/xidebegaguzo.pdf
    • https://cdn.shopify.com/s/files/1/0437/4292/0869/files/bluedio_turbine_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9485/2252/files/44192887642.pdf
    • https://cdn.shopify.com/s/files/1/0429/3305/9737/files/35314240920.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/beyond_good_and_evil_pc_iso.pdf
    • https://cdn.shopify.com/s/files/1/0430/3332/9817/files/34715260854.pdf
    • https://cdn.shopify.com/s/files/1/0434/2844/6358/files/61027608014.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0810/files/wells_fargo_save_as_you_go.pdf
    • https://cdn.shopify.com/s/files/1/0438/3545/7698/files/singer_sewing_machine_manual_free_download.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_off00006f42.bin
69b0a39382cb14c0f9601e5f65d3f64d30a25c744864e591468132efa41feb33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F42 5276 bytes
font_01_sfnt_off00008145.bin
1e9a180ecde57a78b90f9dd3e1a0dc86fef20ae980ff3269c1820880d69faf0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8145 10012 bytes

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