Malicious PDF — malware analysis report

Static analysis result for SHA-256 94a87b57950ee5d4…

MALICIOUS

PDF

52.4 KB Created: 2020-08-01 12:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfbf10bead20f8eaac23976555ad8f65 SHA-1: 345b2e13ec68489000d858737711e0d7e14165fa SHA-256: 94a87b57950ee5d4bad852e7f8c0f1016802bfde8985e4a50f777b5cf2c15e28
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a book download, which is a common social engineering tactic. The ML classifier strongly indicated maliciousness, and the presence of numerous external PDF links suggests a link farm designed to distribute malware or phish for credentials. The embedded URL points to a redirector that likely leads to a malicious payload.

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=living+religions+10th+edition+pdf
    • http://files.dunphyshandguntraining.com/uploads/1/3/2/6/132681566/d354c601d.pdf
    • http://files.ersterkindergarten.com/uploads/1/3/1/4/131437318/1489915.pdf
    • http://files.middleschoolcomputerprojects.org/uploads/1/3/2/6/132681409/mudenegetix_tanuzikozukozo_biwijosudaz_lumali.pdf
    • http://files.filmonemedia.com/uploads/1/3/1/4/131438260/ff29bf6f9.pdf
    • https://cdn.shopify.com/s/files/1/0431/6341/8784/files/jaxozujabugirediwine.pdf
    • https://cdn.shopify.com/s/files/1/0433/8476/6620/files/rumavulajogapenibudexuwew.pdf
    • https://cdn.shopify.com/s/files/1/0431/5047/5413/files/pesusaxus.pdf
    • https://cdn.shopify.com/s/files/1/0434/4745/1798/files/2006_corvette_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/8300/5093/files/vekexafupewolekizekumav.pdf
    • https://cdn.shopify.com/s/files/1/0428/4992/7327/files/tidopotesizifu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8510/3255/files/81660766455.pdf
    • https://cdn.shopify.com/s/files/1/0427/4978/8327/files/9388474900.pdf
    • https://cdn.shopify.com/s/files/1/0437/0386/1401/files/66061819844.pdf
    • https://cdn.shopify.com/s/files/1/0434/5584/0409/files/zujimuw.pdf
    • https://cdn.shopify.com/s/files/1/0432/0935/9520/files/precalculus_james_stewart.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3627/files/ludulopurevekukug.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_off000086a5.bin
3ac25d7216daa1694bb52f582c765557591a3529e7e0c2a74bf56e16aae97079
pdf-font-stream PDF embedded font (sfnt) at offset 0x86A5 5288 bytes
font_01_sfnt_off000098b5.bin
c7ccf8a38090cdbdd9f4040c3a5e7d5e71cedcd92a3c6ea7bdf78b5f96c1b365
pdf-font-stream PDF embedded font (sfnt) at offset 0x98B5 13580 bytes