Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb6505e6ccb56a3…

MALICIOUS

PDF

43.4 KB Created: 2020-08-11 21:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57e565ede8b41da13c6080c26da4f4b2 SHA-1: fe465a6f3f32566bb2c276d9cb843ec0ec04cca7 SHA-256: 6cb6505e6ccb56a377b3a38db94abee7d412f30c2058df92ce9bf0e1feadb308
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm and a critical redirector link pointing to malicious infrastructure, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious. Although no scripts were extracted, the presence of embedded URLs and the PDF structure suggest an attempt to redirect users to potentially harmful content.

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=ejercicio+aer%25C3%25B3bico+y+anaerobio+pdf
    • http://files.brewsterwhitecaps.com/uploads/1/3/0/7/130776168/a5eb161.pdf
    • http://jawalul.cosplayinkfactory.com/uploads/1/3/1/8/131857054/73437ebb76b4.pdf
    • http://files.inkybluestudio.com/uploads/1/3/1/3/131379530/720025.pdf
    • http://files.510radio.com/uploads/1/3/1/1/131164231/e17a7c3.pdf
    • http://goxojuxa.songmountainwushu.com/uploads/1/3/1/4/131437423/duganu-punejetinuxe-bobofarewuwodog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0440/4799/0934/files/nanemitosal.pdf
    • https://cdn.shopify.com/s/files/1/0430/9889/8592/files/4607987350.pdf
    • https://cdn.shopify.com/s/files/1/0440/1207/7206/files/jovekawulu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3581/9173/files/tomufesuvepopefitafilekos.pdf
    • https://cdn.shopify.com/s/files/1/0430/6573/7370/files/mapetolutajefuk.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kepudanunakadop.pdf
    • https://cdn.shopify.com/s/files/1/0448/3943/6449/files/sda_hymnal_with_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0429/1778/9862/files/49325884660.pdf
    • https://cdn.shopify.com/s/files/1/0433/8289/8840/files/8000762031.pdf
    • https://cdn.shopify.com/s/files/1/0434/2480/9122/files/35558101653.pdf
    • https://cdn.shopify.com/s/files/1/0428/8957/6601/files/darkrp_kidnapping_mod_1._16.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e9e.bin
eb558475e313485a85d625acfa4c5b379e4e3fdd499a6c00355af9dc201c428b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E9E 5056 bytes
font_01_sfnt_off00006f94.bin
c6f15b539967873cd8c569346467f8f3fba4ffdf7ea41f3a12979c3009b2c86c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F94 10036 bytes
font_02_sfnt_off00009038.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9038 4324 bytes

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