Malicious PDF — malware analysis report

Static analysis result for SHA-256 eece3c6ad4dcf5d9…

MALICIOUS

PDF

44.8 KB Created: 2020-08-21 19:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0df16de7f8024cfd007a32911c79ac97 SHA-1: 69c8c75667727b92a2e3e391c99cc80d173b07f3 SHA-256: eece3c6ad4dcf5d97f2f3d309dd43a33bf332e74e642ef90fa3e0542978725cd
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL and text related to a 'converting metric units worksheet grade 4', suggesting a lure. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be social engineering via a deceptive link within the PDF.

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.ru/pify?keyword=converting+metric+units+worksheet+grade+4
    • http://zusam.wheelchairaccessdesign.com/uploads/1/3/2/7/132710603/5088958.pdf
    • http://vimit.drhollysavoy.com/uploads/1/3/0/9/130969205/jenig_deduligovaxini_vawilaved_mupato.pdf
    • http://xulaw.morschmachine.com/uploads/1/3/1/1/131164112/100912.pdf
    • https://cdn.shopify.com/s/files/1/0447/9424/9377/files/cisco_ccdp_arch_simplified.pdf
    • https://cdn.shopify.com/s/files/1/0438/5131/7408/files/alta_fidelidade_livro_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6143/files/96749566500.pdf
    • https://cdn.shopify.com/s/files/1/0436/2820/0096/files/lujuda.pdf
    • https://cdn.shopify.com/s/files/1/0429/3672/9766/files/modusof.pdf
    • https://cdn.shopify.com/s/files/1/0429/9322/1783/files/rerugalijipidudojalito.pdf
    • https://cdn.shopify.com/s/files/1/0430/8271/1201/files/35420795986.pdf
    • https://cdn.shopify.com/s/files/1/0428/9868/6119/files/asciidoctor_font_size.pdf
    • https://cdn.shopify.com/s/files/1/0436/5815/0046/files/29557071557.pdf
    • https://cdn.shopify.com/s/files/1/0431/4886/9789/files/jofuvelutefosukuzumere.pdf
    • https://cdn.shopify.com/s/files/1/0434/5092/5223/files/action_bar_hide_android_studio.pdf
    • https://cdn.shopify.com/s/files/1/0432/8492/2526/files/xubuvapumamiwapozaviv.pdf
    • https://cdn.shopify.com/s/files/1/0433/9872/5793/files/vusapovavubunilotirir.pdf
    • https://cdn.shopify.com/s/files/1/0437/9112/2584/files/letito.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000705c.bin
cf600d4435b3a358133979fdd6a132127f39299523ab4198e448538cd50d23d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x705C 5528 bytes
font_01_sfnt_off00008321.bin
939e898875b6d5b566e6e68eeac6b45eb8d990e7d8b45e789b5383358eddeaec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8321 10064 bytes

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