Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c4693d94c4830de…

MALICIOUS

PDF

47.3 KB Created: 2020-08-01 04:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b193fbda83d30a2d0808fefa2088e796 SHA-1: 2f77ee5ba8acdf3185a3c856f5984673b63415e8 SHA-256: 0c4693d94c4830de26d9a0fb80be964587a3b4bfd90ea924a2d0ecae3c885acb
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to file conversion and includes URLs that are part of a link farm, suggesting a lure to malicious content. The ML classifier also strongly indicated maliciousness.

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=convert+a+publisher+file+to+pdf
    • http://files.christinamarshalllmt.com/uploads/1/3/1/4/131406537/1768102.pdf
    • http://files.lindisfarne.org.nz/uploads/1/3/1/3/131380316/9374b9991d5.pdf
    • http://files.huckleecology.com/uploads/1/3/1/6/131606486/c0a66ffe1b575.pdf
    • http://files.baldmannhumans.com/uploads/1/3/1/4/131438759/3870645.pdf
    • http://files.stockbridgerobotics.com/uploads/1/3/1/1/131163736/ziwirarotekes_junapenowokumo_begomobevexaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1729/8329/files/fagaliwopejeletipopoxatit.pdf
    • https://cdn.shopify.com/s/files/1/0435/0102/7493/files/74475977106.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3680/files/tujimorodef.pdf
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/60313265040.pdf
    • https://cdn.shopify.com/s/files/1/0430/7252/0352/files/tufexipemofewumafotexuxon.pdf
    • https://cdn.shopify.com/s/files/1/0440/6562/0118/files/xevarokib.pdf
    • https://cdn.shopify.com/s/files/1/0427/7708/4070/files/mexevenu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0281/4876/files/wikox.pdf
    • https://cdn.shopify.com/s/files/1/0432/4042/3587/files/89991944715.pdf
    • https://cdn.shopify.com/s/files/1/0431/7272/4897/files/bazurejowejomag.pdf
    • https://cdn.shopify.com/s/files/1/0431/1531/5349/files/wiwamuzemolusazovirokivu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6648/files/80638769471.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57955619809.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_off0000659f.bin
a264c366edb6948ed8b910bfbb31c5e7e5ad248cd042968a178ccb49f2105a07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x659F 5232 bytes
font_01_sfnt_off0000775e.bin
7b869df90eb58ce41f97e7434b35cb9fa9fbb411a5e5a0b67b1814c127846217		 pdf-font-stream PDF embedded font (sfnt) at offset 0x775E 10364 bytes
font_02_sfnt_off00009afb.bin
c497e7020956884876526f9a9d0138e4369f5c46b3391b62f16f330352c2bc8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AFB 16076 bytes

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