Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e8911683cca262f…

MALICIOUS

PDF

44.8 KB Created: 2020-08-11 06:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d81ae3737d2982f989ec273641c4b661 SHA-1: 79ca00b6b28128f983c807dcee9a9e1e03776c55 SHA-256: 5e8911683cca262fdbb889e0e3e5c1534c3685deef4ed6d28cf51f4f74ff4d0d
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 the URL that leads to this redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to malicious infrastructure via embedded links.

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=ms+pipe+class+a+b+c+chart+pdf
    • http://files.silverjewellerybypeterkibbles.com/uploads/1/3/1/3/131381607/zojawuxa-wofixuj-fajesiloraju-jedakumo.pdf
    • http://files.buespta.org/uploads/1/3/1/8/131857914/tetapajepat_rodapi_zidotebuma.pdf
    • http://files.dougsheat.com/uploads/1/3/0/9/130969576/8469915.pdf
    • http://netoj.seitecclimbhigher.org/uploads/1/3/1/4/131406082/5423305.pdf
    • http://files.digistormers.com/uploads/1/3/1/0/131071256/gugozuvifalok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5257/1555/files/causas_do_aneurisma_cerebral.pdf
    • https://cdn.shopify.com/s/files/1/0431/5329/3469/files/36886509898.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6248/files/30818979582.pdf
    • https://cdn.shopify.com/s/files/1/0431/8570/1019/files/15817315674.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/62009540155.pdf
    • https://cdn.shopify.com/s/files/1/0428/3462/4679/files/vumojipikunabulirawowa.pdf
    • https://cdn.shopify.com/s/files/1/0428/6673/7311/files/xebuniwotapuribawere.pdf
    • https://cdn.shopify.com/s/files/1/0430/7304/4642/files/woxilumax.pdf
    • https://cdn.shopify.com/s/files/1/0430/8362/8697/files/72093544931.pdf
    • https://cdn.shopify.com/s/files/1/0436/6431/0425/files/78088281378.pdf
    • https://cdn.shopify.com/s/files/1/0431/5670/1348/files/74265827227.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/59260897737.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_off0000649e.bin
dfce3e7c1cb50f39b4570eb0ec182b5e306dc924efb59de775fdcb6a1d5cae14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x649E 5388 bytes
font_01_sfnt_off000076e4.bin
de7c03710142cb0f9940e0ac7d35c3e396fc52a9e1519241bf9369c66a82d1a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76E4 15128 bytes

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