Malicious PDF — malware analysis report

Static analysis result for SHA-256 5efb8d8c5370bfbe…

MALICIOUS

PDF

47.9 KB Created: 2020-08-08 14:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2c6ddd8a6d14b211859e6df5321bbac SHA-1: 0c6f2282a9de32b46ac2610eae6306d1438bbaeb SHA-256: 5efb8d8c5370bfbe669e381fd402e6ca03ff3c8cd438fd8fd89db02ef3a16f27
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, forming a link farm. One prominent link directs to a known malicious redirector, indicating an attempt to lead users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm attack pattern.

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=origin+of+computer+graphics+pdf
    • http://files.jeepinforjesus.com/uploads/1/3/0/8/130813042/2585817.pdf
    • http://files.pennyormsbee.ca/uploads/1/3/0/7/130775017/2113830.pdf
    • http://files.montevistalacrosse.com/uploads/1/3/1/3/131398574/d61e585657cdb8c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1561/8215/files/chhattisgarh_map_blank.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ledoviz.pdf
    • https://cdn.shopify.com/s/files/1/0434/1566/6840/files/lojuxumaregexajinukoloze.pdf
    • https://cdn.shopify.com/s/files/1/0434/0154/3830/files/ecological_pyramids_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/releninibijexotulajutavur.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/50306279194.pdf
    • https://cdn.shopify.com/s/files/1/0434/2392/4376/files/zoology_textbook_class_11.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/xavofukimale.pdf
    • https://cdn.shopify.com/s/files/1/0429/8794/6143/files/oreshura_episode_1.pdf
    • https://cdn.shopify.com/s/files/1/0432/1368/4891/files/zumisiradarojawadopu.pdf
    • https://cdn.shopify.com/s/files/1/0435/0525/4566/files/mixed_present_tenses_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0429/5871/7087/files/hemifacial_spasm_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0431/8514/3969/files/lejositomubuxuvepixoponok.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_off00006790.bin
c28a6660e1c9be2ff9f658039fee0f62268aa68fa43e6bdb800d9dca866c7f7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6790 5564 bytes
font_01_sfnt_off00007a52.bin
e4bc8b245ff0fa2eaaaf9563213c7190a97eea58594840d6587d4f52c710a96d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A52 9860 bytes
font_02_sfnt_off00009c47.bin
0d7b5de48ff5001cbee3948371e67b6999b3c8dc9da2328298d75d3db101b009		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C47 16040 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.