Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4d2fb8d417cef9…

MALICIOUS

PDF

54.6 KB Created: 2020-08-19 23:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e89966d01016976c8f3beb47562ee0b2 SHA-1: bffee708374ed98b50b9a7c79be715ddb841fcba SHA-256: cf4d2fb8d417cef9d8505dec46dbfa82a9ac60ae5b01f1e4017da430eaa89544
154 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and embedded URLs, including a primary malicious redirector at 'https://ttraff.ru/pify?keyword=bessemer+furnace+pdf'. The presence of numerous embedded links suggests a campaign to drive traffic to potentially harmful 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=bessemer+furnace+pdf
    • http://files.rashadsofly.com/uploads/1/3/0/7/130738524/tavusimom.pdf
    • http://files.theloveofwords.com/uploads/1/3/0/8/130813888/fedodufenasub.pdf
    • http://wazel.howtobeastrongwoman.com/uploads/1/3/1/4/131406801/5687334.pdf
    • http://files.everlongcreative.com/uploads/1/3/0/7/130775163/7540740.pdf
    • https://cdn.shopify.com/s/files/1/0437/0228/8537/files/23170391693.pdf
    • https://cdn.shopify.com/s/files/1/0432/6077/2516/files/certificate_of_origin_template_chile.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0096/files/xorufimemozawizijuxi.pdf
    • https://cdn.shopify.com/s/files/1/0441/0087/8488/files/joana_s_leveling_guide_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/7193/0529/files/50944386539.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gekisemegudifusoledo.pdf
    • https://cdn.shopify.com/s/files/1/0438/4584/5152/files/71074910010.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_off0000980d.bin
d14406b896f4973c110c7c045d7ababab445932f791d9f98f926ee50f6d471d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x980D 5320 bytes
font_01_sfnt_off0000aa05.bin
baa23e20d9d18dd11e7c3ee458db8524d53260fc2027f5982bea94178a509fef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA05 10640 bytes

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