Malicious PDF — malware analysis report

Static analysis result for SHA-256 434ee914b18c4ba2…

MALICIOUS

PDF

50.1 KB Created: 2020-08-01 09:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23a4c54feb0ed54bd273834667b52773 SHA-1: 63e6a46304e154aecc0f5695d7e057d05dfa2a69 SHA-256: 434ee914b18c4ba2e9158c1245946e71482d0c01578e77c946f2abbd1b15c71d
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting the primary intent is to lure the user to a compromised site. No scripts were extracted, but the presence of numerous links points to a link-farming or redirection 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=af+form+724+pdf
    • http://files.beyou.online/uploads/1/3/1/4/131482941/wuruzititupemus_gizifaxav_sizazud.pdf
    • http://files.ww2tv.com/uploads/1/3/1/3/131383541/noxosulot.pdf
    • http://files.arenalrainforestproperties.com/uploads/1/3/2/6/132695543/tefelizaxoxut.pdf
    • https://cdn.shopify.com/s/files/1/0431/4647/7722/files/17918065164.pdf
    • https://cdn.shopify.com/s/files/1/0437/2643/8550/files/fepadijusufawufaxalexax.pdf
    • https://cdn.shopify.com/s/files/1/0428/2771/0630/files/siwukiboxole.pdf
    • https://cdn.shopify.com/s/files/1/0430/6750/6841/files/gufonenam.pdf
    • https://cdn.shopify.com/s/files/1/0436/6611/2662/files/korovemanepawet.pdf
    • https://cdn.shopify.com/s/files/1/0434/3581/9173/files/88530319975.pdf
    • https://cdn.shopify.com/s/files/1/0434/8903/4402/files/46205221994.pdf
    • https://cdn.shopify.com/s/files/1/0435/7183/9135/files/php_decimal_format.pdf
    • https://cdn.shopify.com/s/files/1/0429/9846/4661/files/41402046282.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/48787523288.pdf
    • https://cdn.shopify.com/s/files/1/0430/3300/2145/files/mixevejetazufajedasitim.pdf
    • https://cdn.shopify.com/s/files/1/0437/1818/1013/files/berixajaxipirenozov.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_off00006ff4.bin
bf38bc2df0d2c3e56a170579107d71de20e2e6fb7d2386144b60b60d5d5fcdcd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF4 4492 bytes
font_01_sfnt_off00007f35.bin
059671c963d6e89ac309feec59637301170e500890cd8ceac471fcdc3e5287d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F35 14856 bytes
font_02_sfnt_off0000ad81.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0xAD81 4324 bytes