Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb8eb04576aed376…

MALICIOUS

PDF

39.1 KB Created: 2020-08-25 13:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d582d5bfee9982ab867a9866ea59c790 SHA-1: b8be6c3e9c56a7db74f465da188501d55f80e75d SHA-256: eb8eb04576aed3761aed4c0d6b130de3fe7f97ff6eb4fdef049de728a8252919
152 Risk Score

Malware Insights

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

The PDF contains a link to a redirector infrastructure, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body and embedded URLs suggest a lure related to 'post study work visa' information. The ML classifier strongly flagged this PDF as malicious. The primary IOC is the malicious redirector URL, which likely leads to a further stage of the attack.

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=post+study+work+visa+open+form+nz
    • http://files.maddiebro.com/uploads/1/3/1/1/131164424/1649234.pdf
    • https://cdn.shopify.com/s/files/1/0431/1361/1421/files/81399817063.pdf
    • https://cdn.shopify.com/s/files/1/0430/3942/4669/files/9851130342.pdf
    • https://cdn.shopify.com/s/files/1/0430/5190/9274/files/14289590237.pdf
    • https://cdn.shopify.com/s/files/1/0435/4008/6935/files/zetedugetoxarowofoxefu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5791/3749/files/fotapukogesoduma.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/barefoot_investor_2020_audible.pdf
    • https://cdn.shopify.com/s/files/1/0428/6405/0332/files/helen_of_troy_1956.pdf
    • https://cdn.shopify.com/s/files/1/0432/0736/0667/files/96770940421.pdf
    • https://cdn.shopify.com/s/files/1/0429/4659/2924/files/55361511644.pdf
    • https://cdn.shopify.com/s/files/1/0428/6955/5356/files/35329043599.pdf
    • https://cdn.shopify.com/s/files/1/0435/4441/2309/files/23008655514.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_off00005859.bin
b69fd4afb4dca1eecfbeb2c2b6cc2cec683bcb48c8e99e097ae156a6f9265bf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5859 5524 bytes
font_01_sfnt_off00006b32.bin
6cf8041068063c53847dbb913af76d9b023e0c1a6be6d9e001b92f66a39d108a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B32 10804 bytes

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