Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08834ffe36283dc…

MALICIOUS

PDF

41.1 KB Created: 2020-08-10 10:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e35f47c85e82b29e5bf74ae652d61afa SHA-1: 6753b46663ebb88836ba6772d93ce914a19390d6 SHA-256: a08834ffe36283dc321bcf67878a5868c2e14dca98f54f8462f4fc90d3a9abd4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass of external links, many of which point to a link farm hosted on Shopify, and one critical link to a known malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic, suggesting the primary intent is to redirect the user to malicious infrastructure.

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=adlerian+counseling+and+psychotherapy+a+practitioner+s+approach+pdf
    • http://files.subnum.org/uploads/1/3/0/7/130776208/sudidojakadefi_zufuvok_sudux.pdf
    • http://satusu.myssatraining.com/uploads/1/3/2/6/132680813/defefeful.pdf
    • http://dibipopi.marisalivet.com/uploads/1/3/1/1/131164250/4027053.pdf
    • http://nipewasev.plantsandfriendstogo.com/uploads/1/3/1/0/131070450/fovajilig.pdf
    • https://cdn.shopify.com/s/files/1/0431/0571/4338/files/nikejutaduzowi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2684/0738/files/how_to_delete_games_on_xbox_one.pdf
    • https://cdn.shopify.com/s/files/1/0435/3828/4696/files/html_to_open_source.pdf
    • https://cdn.shopify.com/s/files/1/0435/9385/9240/files/14603480321.pdf
    • https://cdn.shopify.com/s/files/1/0434/6845/6086/files/zukiwu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5349/8019/files/29551894493.pdf
    • https://cdn.shopify.com/s/files/1/0433/1284/0872/files/pibobo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2384/2978/files/mexofuwoxigesigobi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5398/1594/files/stone_sword_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0428/0641/1431/files/69784791389.pdf
    • https://cdn.shopify.com/s/files/1/0449/5812/2139/files/barmen_declaration.pdf
    • https://cdn.shopify.com/s/files/1/0431/1610/1798/files/54975876428.pdf
    • https://cdn.shopify.com/s/files/1/0429/9200/9365/files/adobe_premiere_pro_cc_2020_help.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_off0000615e.bin
ad403c530e03210efd362e8d2e6743d3e9928caaf7a94f2d387e7fe81f5b05f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x615E 5508 bytes
font_01_sfnt_off0000741f.bin
2fd1ee3bd07fb7958503b3f2f05a2fb9e8d7d2e6ee1b38e134cdf7634b919a27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x741F 9956 bytes

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