Malicious PDF — malware analysis report

Static analysis result for SHA-256 450b1620dff831e6…

MALICIOUS

PDF

65.8 KB Created: 2020-07-31 14:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e00b0a985e6210f12d02ee7d52ede095 SHA-1: c420968a5945f1d68101809ab0c2de9b10777d9b SHA-256: 450b1620dff831e670a12bc14578531cba2c03ae65fb16fdc180288d0b00fbfd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a lure related to a 'Keto cookbook pdf free' and embeds a link to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, appears to contain metadata related to the lure. The primary attack vector involves redirecting the user to malicious infrastructure via the embedded URL.

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=keto+cookbook+pdf+free
    • http://files.nickeltown.org/uploads/1/3/0/8/130874304/8410948.pdf
    • http://files.ameliasclosetfilm.com/uploads/1/3/1/0/131070688/pagebesaxa.pdf
    • http://files.edmonsoncounty.org/uploads/1/3/0/8/130813985/e838ba9f.pdf
    • http://files.westhoveacupuncture.co.uk/uploads/1/3/1/4/131437848/80216d0beb.pdf
    • http://files.lauraswinkfineart.com/uploads/1/3/0/7/130740624/mugaxanizivasu.pdf
    • http://files.westhoveacupunc
    • https://cdn.shopify.com/s/files/1/0434/7248/6566/files/pilasifugasowotinedur.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/26225030347.pdf
    • https://cdn.shopify.com/s/files/1/0433/8493/0462/files/zejekusufafin.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0724/files/paveroviraxos.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7033/files/68065308195.pdf
    • https://cdn.shopify.com/s/files/1/0433/3443/4974/files/xavawuwavokakatululebub.pdf
    • https://cdn.shopify.com/s/files/1/0430/7730/4484/files/tatakepumame.pdf
    • https://cdn.shopify.com/s/files/1/0432/7482/9987/files/daremaxotefu.pdf
    • https://cdn.shopify.com/s/files/1/0437/2683/1784/files/sukawuge.pdf
    • https://cdn.shopify.com/s/files/1/0437/4816/3738/files/70942742673.pdf
    • https://cdn.shopify.com/s/files/1/0434/7602/5497/files/dujijozusilajuloximol.pdf
    • https://cdn.shopify.com/s/files/1/0432/0005/3408/files/jororidezixalidofijebet.pdf
    • https://cdn.shopify.com/s/files/1/0434/1334/0312/files/duvakizuxuku.pdf
    • https://cdn.shopify.com/s/files/1/0430/7589/5450/files/finenukasoletap.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_off0000c59f.bin
6cd0751b14d4e1b009239f1b9f0599147b7be7962d44b96199ab715268925ce2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC59F 4536 bytes
font_01_sfnt_off0000d517.bin
2eb5f15bbedded9558585a657e01d03e675da618ac3b71e4345c5c847a77a284		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD517 10804 bytes

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