Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3cb5020baefdfa4…

MALICIOUS

PDF

42.2 KB Created: 2020-08-02 13:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e41fb9986159f841541246a91dd830be SHA-1: 2e60355b22a0a2a6bdf5f0d79645795b98b9b066 SHA-256: d3cb5020baefdfa444ff66d45bfd25bb07ae450460a2095bbccbf1358127ad7a
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, masquerading as a Winchester reloading manual, to a redirector URL. The primary heuristic indicates that the PDF links to known malicious redirector infrastructure. The ML classifier strongly supports the malicious verdict. No scripts were extracted from this sample.

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=winchester+reloading+manual+pdf
    • http://files.annishealinggarden.com.au/uploads/1/3/0/7/130776864/kuxafixogudaruwuje.pdf
    • http://files.ashleyshellhause.com/uploads/1/3/1/4/131407445/nuzoposag.pdf
    • http://files.olilazarusphotography.com/uploads/1/3/1/6/131606368/3009102.pdf
    • http://files.subtek-music.com/uploads/1/3/2/6/132681826/9762463.pdf
    • http://files.cbcfreeport.org/uploads/1/3/1/3/131381422/5164.pdf
    • https://cdn.shopify.com/s/files/1/0434/7055/3238/files/netipiberokexab.pdf
    • https://cdn.shopify.com/s/files/1/0432/4796/0232/files/mukorifuxutadibujurof.pdf
    • https://cdn.shopify.com/s/files/1/0431/6600/7445/files/vipug.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/87917235263.pdf
    • https://cdn.shopify.com/s/files/1/0434/0301/8392/files/87241653119.pdf
    • https://cdn.shopify.com/s/files/1/0432/2459/6642/files/55974775053.pdf
    • https://cdn.shopify.com/s/files/1/0435/0240/3750/files/agm_service_mac.pdf
    • https://cdn.shopify.com/s/files/1/0433/7539/4977/files/golang_read_file_line_by_line.pdf
    • https://cdn.shopify.com/s/files/1/0428/9721/1551/files/pesigezemomixasisamomo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4469/9288/files/vibedunideveb.pdf
    • https://cdn.shopify.com/s/files/1/0435/3690/8439/files/fugewadigaregaganajidof.pdf
    • https://cdn.shopify.com/s/files/1/0430/4656/8098/files/29015443223.pdf
    • https://cdn.shopify.com/s/files/1/0429/0812/3303/files/49846873983.pdf
    • https://cdn.shopify.com/s/files/1/0436/7086/4025/files/moludemazufigo.pdf
    • https://cdn.shopify.com/s/files/1/0438/5079/3110/files/17530957402.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_off00006530.bin
8c9401e98ff19889d0e6768c13a77a62997a11091307575facdccc0e88929538		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6530 5580 bytes
font_01_sfnt_off00007810.bin
ea3ee54b819763f5e75b1a2a715df4d125c60a7850dfc5dc72ee0588c8515fce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7810 10408 bytes

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