Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b94067cadfc43ac…

MALICIOUS

PDF

55.1 KB Created: 2020-07-29 20:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7714636272cad5d49a440649a2225457 SHA-1: 2a0c37cf62e15b022796745cdd0b982980ef416c SHA-256: 5b94067cadfc43ace97a944f3cbcf50ae91dfdfaf50f532c4644783f24f97dd6
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files, a technique often used for SEO poisoning to drive traffic to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=transistor+bd139+datasheet+pdf'. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, preventing a detailed analysis of its specific content beyond the presence of the keyword 'transistor bd139 datasheet pdf'.

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=transistor+bd139+datasheet+pdf
    • http://files.celestecrystals.com/uploads/1/3/2/3/132303175/6ccd315ab77e03.pdf
    • http://files.kunape.org/uploads/1/3/1/3/131380341/c6cd8a483a.pdf
    • http://files.suncrestelc.com/uploads/1/3/1/8/131856277/e3eb637ae.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5470/2496/files/vekadi.pdf
    • https://cdn.shopify.com/s/files/1/0440/3258/9989/files/zavomat.pdf
    • https://cdn.shopify.com/s/files/1/0431/2743/9526/files/bezevaripaloxegerefive.pdf
    • https://cdn.shopify.com/s/files/1/0428/7735/4143/files/36619222112.pdf
    • https://cdn.shopify.com/s/files/1/0437/7572/1633/files/41163433301.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/paxeluligipakavekor.pdf
    • https://cdn.shopify.com/s/files/1/0432/0041/3856/files/xodijedawaxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/1945/9998/files/rirulo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/3785448733.pdf
    • https://cdn.shopify.com/s/files/1/0438/1625/5645/files/33734273984.pdf
    • https://cdn.shopify.com/s/files/1/0428/9714/6019/files/wopivexasufagomoremidax.pdf
    • https://cdn.shopify.com/s/files/1/0438/4853/2128/files/jotusas.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076f4.bin
16d70862c3d3c201b8b7bef5b67680086eef89f074413e3fb431b26757f1f270		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76F4 5344 bytes
font_01_sfnt_off00008904.bin
e1d478429d72f219581fa133c6145df8195cae28ed9d88a5daad59af59e5b9b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8904 15952 bytes
font_02_sfnt_off0000ba5e.bin
d657604601c07a6cf666dc8a00d19994aa5efb5edd91eeca27759d64a9703145		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5E 16084 bytes

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