Malicious PDF — malware analysis report

Static analysis result for SHA-256 37926c5a6fad159e…

MALICIOUS

PDF

57.0 KB Created: 2020-08-18 16:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c87badc0fb8191862337af0bdd34944 SHA-1: f880bf22d990a63b2ebf2428208670c50b3b5863 SHA-256: 37926c5a6fad159e1a68cffcea379596feba2e4a3b42e08ad596a72ddc92dacd
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely intended to lead the user to a phishing or malware distribution site. The document body, though heavily obfuscated, contains the same URL and a search query related to 'xamarin android splash screen example', suggesting a lure. The presence of a large number of external PDF links also indicates a link farm, a common tactic for SEO poisoning to drive traffic to malicious sites.

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=xamarin+android+splash+screen+example
    • http://nekegej.kettlecornnc.com/uploads/1/3/1/0/131070934/zixomid-mozutizamifam-lazudu.pdf
    • http://files.thebirdiebox.com/uploads/1/3/2/6/132682204/wexikenokunubul-tekunu-pojusibinodijed.pdf
    • http://files.donnaliberalistore.com/uploads/1/3/2/6/132681826/9086646.pdf
    • http://files.flequipment-neelyville.com/uploads/1/3/0/8/130813511/440ccec1a72.pdf
    • http://files.flequipment-neelyville.com/uploads/1
    • https://cdn.shopify.com/s/files/1/0432/1103/0683/files/83013763961.pdf
    • https://cdn.shopify.com/s/files/1/0431/6338/6016/files/48588019787.pdf
    • https://cdn.shopify.com/s/files/1/0434/1789/5068/files/22845949270.pdf
    • https://cdn.shopify.com/s/files/1/0439/3716/9576/files/bleacher_report_college_football_week_5_picks.pdf
    • https://cdn.shopify.com/s/files/1/0432/3645/8654/files/76968011793.pdf
    • https://cdn.shopify.com/s/files/1/0436/2852/7776/files/zunowupiwunosunuge.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3444/files/35850773304.pdf
    • https://cdn.shopify.com/s/files/1/0433/5871/6054/files/24624629752.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/ultimate_member_shortcodes.pdf
    • https://cdn.shopify.com/s/files/1/0430/7641/9744/files/22073255829.pdf
    • https://cdn.shopify.com/s/files/1/0438/4145/4240/files/63444295080.pdf
    • https://cdn.shopify.com/s/files/1/0436/6581/7753/files/fojuroxogixivuze.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000646f.bin
b2306119f2ee3494d88a87758e68f56153afcd52eb53f20ca84537378283b76a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x646F 18560 bytes
font_01_sfnt_off00009f85.bin
b8da584d562d87ec38051e8975b96b412d40a281505812095e1c624ea33e80b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F85 5360 bytes
font_02_sfnt_off0000b186.bin
901476b4791cba6602bd21e9b30ec55106b40e559129e1f33022b1561d48f2e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB186 10748 bytes

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