Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56d54db81305834…

MALICIOUS

PDF

42.7 KB Created: 2020-08-20 03:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30ed294aae19f4e2083ea7389d158601 SHA-1: c6fb3711d3e5523ac3bdd10bd269d64e0816ca39 SHA-256: d56d54db81305834f3c2510a0cfb5a7560b07ad8830f62245b3ddab72efda4b7
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic identifying a link to a known malicious redirector infrastructure at https://ttraff.com/pify?keyword=eylf+outcomes+cheat+sheet. The document body, though heavily obfuscated, contains text suggesting it is a "cheat sheet" related to "Eylf outcomes", likely a lure to entice users to click the malicious link. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=eylf+outcomes+cheat+sheet
    • http://zakizupi.uscequestrian.org/uploads/1/3/1/6/131606407/xewaja.pdf
    • http://files.michellecobbin.co.uk/uploads/1/3/2/7/132741334/8055846.pdf
    • http://tegidojog.salomonk.com/uploads/1/3/0/7/130776271/30940f677601c.pdf
    • http://files.bbbstraighttalksports.com/uploads/1/3/1/1/131164153/xividefasuj_riliduban_pifoje_jijurumikomorif.pdf
    • http://silib.mdnamo.org/uploads/1/3/2/8/132816202/375aa8a8fc.pdf
    • https://cdn.shopify
    • https://cdn.shopify.com/s/files/1/0437/5884/6109/files/fazejaxomesobowa.pdf
    • https://cdn.shopify.com/s/files/1/0429/4334/8892/files/54209340641.pdf
    • https://cdn.shopify.com/s/files/1/0433/4757/4949/files/fezopiwugeduwivive.pdf
    • https://cdn.shopify.com/s/files/1/0437/1077/5464/files/arma_3_cheat_menu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/play_dig_dug_online.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7110/files/91832738369.pdf
    • https://cdn.shopify.com/s/files/1/0433/9105/8078/files/84137519359.pdf
    • https://cdn.shopify.com/s/files/1/0429/7159/4911/files/lotadimudelorokovurixam.pdf
    • https://cdn.shopify.com/s/files/1/0431/4431/5040/files/fijevigiroxo.pdf
    • https://cdn.shopify.com/s/files/1/0437/2794/5889/files/world_cultures_a_global_mosaic.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6152/files/activities_of_daily_living_roper_logan_and_tierney.pdf
    • https://cdn.shopify.com/s/files/1/0440/6099/9830/files/video_facebook_dengan_url.pdf
    • https://cdn.shopify.com/s/files/1/0430/4994/3202/files/nice_guidelines_groin_hernia.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_off00006a22.bin
fd40c1a376867deb2a1336a01ff2def07dcf0ec71918f1a7feacb1caef9a6186		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A22 5084 bytes
font_01_sfnt_off00007b5d.bin
a60a55e15797a5dd73e7a94a076244070cff59a03561e399e674570f4de2fbb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B5D 10012 bytes

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