Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b719255f12172bc…

MALICIOUS

PDF

65.5 KB Created: 2020-08-30 10:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ced352ecd9062696503f0258804718b SHA-1: 2b72515467f5db02adabde9a368099fa3c6fd338 SHA-256: 6b719255f12172bceb8be55991e908adcf2c405b7ff40bf2e66904d69abe3526
154 Risk Score

Malware Insights

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

The PDF contains embedded links, including one pointing to a known malicious redirector at 'https://ttraff.cc/wix?keyword=electromagnetic+force+worksheet+answ'. The document body, though heavily obfuscated, appears to contain text related to a worksheet, suggesting a lure. The presence of numerous external PDF links, many benign, may be an attempt to blend malicious links with legitimate ones or to create a link farm for SEO poisoning. The ML classifier strongly flagged this PDF as malicious.

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/wix?keyword=electromagnetic+force+worksheet+answ
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/3765/5191/files/attestation_d_employeur_destine__ple_emploi_remplissable.pdf
    • https://cdn.shopify.com/s/files/1/0429/7709/9935/files/sugimavexoju.pdf
    • https://cdn.shopify.com/s/files/1/0432/2597/2904/files/naxamupekenif.pdf
    • https://cdn.shopify.com/s/files/1/0438/8945/9368/files/tusidipobi.pdf
    • https://cdn.shopify.com/s/files/1/0427/9776/0668/files/47304702411.pdf
    • https://cdn.shopify.com/s/files/1/0431/2036/1629/files/29024175895.pdf
    • https://cdn.shopify.com/s/files/1/0441/4128/1432/files/45358551691.pdf
    • https://cdn.shopify.com/s/files/1/0434/5102/3526/files/compelling_conversations.pdf
    • https://cdn.shopify.com/s/files/1/0437/3797/2897/files/fudazajijerilizi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5892/1621/files/xuxuroxaxure.pdf
    • https://cdn.shopify.com/s/files/1/0433/6215/6702/files/tutorial_de_wondershare_filmora.pdf
    • https://cdn.shopify.com/s/files/1/0430/9532/6887/files/fuxovu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5d8.bin
92b86d8b9e60d7fbdd59f85a18d7b85934589a540554bfb76b86065f14dd3900		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D8 5196 bytes
font_01_sfnt_off0000c760.bin
4c94271ff8439dda874aadbc8c7fb045f9805d273cc5e003dacf288c0fc5b076		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC760 10468 bytes
font_02_sfnt_off0000eb2b.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2B 4324 bytes

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