Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b436327a9463695…

MALICIOUS

PDF

44.9 KB Created: 2020-08-15 09:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fba3779fecc4059e03601dbabfed1ead SHA-1: e8388a25a12ffce1fbcfb0e1ff7a3b34b535b635 SHA-256: 0b436327a946369527aaa1f1b2e4d5c9585afbc93cea75202f4b6e3b0df4e6f3
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains text related to a '2009 kia rio maintenance manual' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The presence of a large number of external PDF links, many pointing to Shopify domains, indicates a link farm used to distribute malicious content or manipulate search engine results.

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.ru/wb?keyword=2009%20kia%20rio%20maintenance%20manual
    • http://files.wapgc.com/uploads/1/3/2/6/132682204/4679422.pdf
    • http://files.noarderljocht.com/uploads/1/3/1/3/131379014/niwifuwulunama_fazupe_vagaken.pdf
    • http://files.orikiritesofpassage.org/uploads/1/3/2/6/132681824/1b98e158b.pdf
    • http://files.briarwoodsrowing.org/uploads/1/3/0/8/130874620/4da9c7d5f4ec.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0867/1394/files/savenipodupirusab.pdf
    • https://cdn.shopify.com/s/files/1/0437/8991/0167/files/alesis_sr-_16_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/5432/4117/files/dijidodewumusitapej.pdf
    • https://cdn.shopify.com/s/files/1/0431/9127/1586/files/49494991736.pdf
    • https://cdn.shopify.com/s/files/1/0429/7401/9740/files/88349562832.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3876/files/86212148639.pdf
    • https://cdn.shopify.com/s/files/1/0429/9328/7331/files/zepesowazegolivunuf.pdf
    • https://cdn.shopify.com/s/files/1/0438/1281/5008/files/acrilamida_cafe.pdf
    • https://cdn.shopify.com/s/files/1/0429/8558/6849/files/83261727873.pdf
    • https://cdn.shopify.com/s/files/1/0432/6375/4404/files/wepemaxo.pdf
    • https://cdn.shopify.com/s/files/1/0436/0667/1517/files/82758744159.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007324.bin
60c38d5bf42dabde7cc4327c27a0190ec30af781f0f4a0dc0ee442968246265b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7324 5168 bytes
font_01_sfnt_off00008497.bin
6c0b07a533f0a43ede61528865d898da8d1fa17f9ba91474d978ee030a8190e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x8497 10072 bytes