Malicious PDF — malware analysis report

Static analysis result for SHA-256 75e04c712d2a9ec2…

MALICIOUS

PDF

44.1 KB Created: 2020-08-17 17:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e31177f80fd681a826a45d839a7bf47 SHA-1: 5da845107a599c945a028fd63154a8094f491604 SHA-256: 75e04c712d2a9ec25def6e16ebf29da16206f62eb3559d311256eb159d22f41d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'https://ttraff.ru/pify?keyword=anatomy+of+nose+ppt+free'. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=anatomy+of+nose+ppt+free
    • http://files.illuminaskincaremassage.com/uploads/1/3/2/3/132303068/6006168.pdf
    • http://kugulijur.boxcarblog.com/uploads/1/3/2/6/132682883/8422159.pdf
    • http://files.danwickman.com/uploads/1/3/2/8/132815190/c97acde4fd1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/6150/2362/files/nfl_week_1_schedule_spreadsheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/80134972724.pdf
    • https://cdn.shopify.com/s/files/1/0434/0688/5027/files/chmod_400_windows.pdf
    • https://cdn.shopify.com/s/files/1/0430/2995/4721/files/attaching_file_in_word_document.pdf
    • https://cdn.shopify.com/s/files/1/0436/1856/6306/files/gofefo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6710/4668/files/jurnal_manfaat_cacing_tanah.pdf
    • https://cdn.shopify.com/s/files/1/0433/6268/0984/files/84299788588.pdf
    • https://cdn.shopify.com/s/files/1/0428/4448/7836/files/tudofuzewuwewetere.pdf
    • https://cdn.shopify.com/s/files/1/0437/3030/5178/files/vuxubovivujo.pdf
    • https://cdn.shopify.com/s/files/1/0439/2452/1128/files/81434710432.pdf
    • https://cdn.shopify.com/s/files/1/0435/0482/8580/files/xiderodonipefumowa.pdf
    • https://cdn.shopify.com/s/files/1/0435/8235/7663/files/69942068305.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060a6.bin
a12de775bc7ca6223e8fc50efec01f04596653b43615f7051e9262a13887e42a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60A6 4848 bytes
font_01_sfnt_off00007101.bin
3353ec5274f8a06f351288ed9de361a6110c748a858175c72ed598cf609c28d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7101 10564 bytes
font_02_sfnt_off00009503.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9503 4324 bytes

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