Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ca2b3c387dfcd1…

MALICIOUS

PDF

40.6 KB Created: 2020-11-01 06:41:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: fcdc4912693cb8710b804daf2ee2d7e6 SHA-1: 98d067ffda59438030be4dc23320702da3767f35 SHA-256: 85ca2b3c387dfcd1acc45f078c4fc6d312c4415cb3f6aa30b5e67275cda125d9
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ggtraff.ru'. The document body, though heavily obfuscated, contains a URL that matches this finding. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs, suggesting an attempt to generate traffic or distribute malicious 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://ggtraff.ru/123?keyword=dishonored+2+guide+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373788/normal_5f9b29745f123.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/najubu/kent_state_mlis_reddit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/6664/4384/files/fashion_design_vocabulary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5014/7745/files/cheap_android_tablet_with_keyboard.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3721/9735/files/spotify_mod_apk_uptodown.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/2887/9809/files/gapujujazomuzosomu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8017/1174/files/rozepitexoladoluxedosiner.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/51586010763.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/jurnal_morfologi_achatina_fulica.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/8725/5483/files/40_hadees_in_urdu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/6086/7484/files/maytag_performa_dryer_thermal_fuse_part_number.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7376/3496/files/23497138884.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3656/4375/files/gufejorezajaxusiwusiro.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/18886058255.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6474/1026/files/59800246506.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC5 5192 bytes
SHA-256: 9ebe3de6db058aae090283aa77bdf17b1ffaa8d423d394aaa18ba994ec2e5e1b
font_01_sfnt_off00007175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7175 10680 bytes
SHA-256: b618fe8ac99674aee3b4753a348407f513f6e0814ca98c02538446542b8a411f

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