Malicious PDF — malware analysis report

Static analysis result for SHA-256 fca5ced8fbb92b84…

MALICIOUS

PDF

38.4 KB Created: 2020-08-03 06:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9c794a21f42313e5a8ddb79b8014749 SHA-1: 0097eab5251a65a69c34ac002e2836e6ad6e78d1 SHA-256: fca5ced8fbb92b843ae6c7dd4701c584a4b099ef9e960cb20cba18964fe92bc5
152 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to a malicious redirector, which then directs users to a link farm of other PDF files. The ML classifier strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which is part of a common lure for phishing or malware delivery.

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=kenmore+elite+refrigerator+model+795+manual
    • http://files.pelevenart.com/uploads/1/3/0/7/130775241/4633648.pdf
    • http://zorajefek.freshenitup.org/uploads/1/3/1/6/131636655/7442652.pdf
    • http://files.stdavidsmold.org/uploads/1/3/1/3/131382243/bagoli_gemutanevapam.pdf
    • https://cdn.shopify.com/s/files/1/0437/2925/6613/files/wutegorabedirepanesun.pdf
    • https://cdn.shopify.com/s/files/1/0430/0380/5847/files/bajopone.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8456/files/zegorilukazelo.pdf
    • https://cdn.shopify.com/s/files/1/0434/8936/2082/files/sedalinisijufonijerol.pdf
    • https://cdn.shopify.com/s/files/1/0440/8174/1976/files/8144622435.pdf
    • https://cdn.shopify.com/s/files/1/0428/8249/8716/files/19520251509.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/87816704533.pdf
    • https://cdn.shopify.com/s/files/1/0431/0702/5056/files/42866147841.pdf
    • https://cdn.shopify.com/s/files/1/0429/0609/1673/files/pulosij.pdf
    • https://cdn.shopify.com/s/files/1/0429/2512/9891/files/71806971543.pdf
    • https://cdn.shopify.com/s/files/1/0430/3811/3955/files/feveg.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54183348773.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c52.bin
8863cfe70fba046a8e215326eb473c222e95d04a326e12eb72a9179c646445f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C52 5260 bytes
font_01_sfnt_off00005e2a.bin
a289cf8081d99fedee7fc35e644dae99ebd13e80b482cb4df751f547cb77f921
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E2A 9544 bytes
font_02_sfnt_off00007eb2.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EB2 4324 bytes