Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ef2c51537346ac…

MALICIOUS

PDF

46.6 KB Created: 2020-08-27 18:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d5b4efe7b9889a1e80ca5d1c2160d88 SHA-1: d43a6d310506ae500f1ed514ed54d208b7df4808 SHA-256: 93ef2c51537346ac75f6ebb49991162528f05ec5286cc5704551506d53d444bb
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at https://ttraff.ru/pify?keyword=flutterby+fairy+instructions. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to redirect the user to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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=flutterby+fairy+instructions
    • http://files.stpatricknf.ca/uploads/1/3/2/7/132712011/459286.pdf
    • http://files.lybarcreations.com/uploads/1/3/0/7/130776483/47b426b2137ab8.pdf
    • http://files.elitelinesny.com/uploads/1/3/0/8/130874474/juzepiva-fixesuposorafim.pdf
    • http://betuvor.hellofoodreviews.com/uploads/1/3/2/6/132682124/5774063.pdf
    • http://files.coloradogamewornhockey.com/uploads/1/3/1/0/131070689/6256951.pdf
    • https://cdn.shopify.com/s/files/1/0462/2123/0233/files/weather_report_for_cohoes_new_york.pdf
    • https://cdn.shopify.com/s/files/1/0430/9729/2949/files/1077689415.pdf
    • https://cdn.shopify.com/s/files/1/0428/2174/6847/files/gopad.pdf
    • https://cdn.shopify.com/s/files/1/0434/9113/1554/files/phn_mm_chuyn_sang_jpg_online.pdf
    • https://cdn.shopify.com/s/files/1/0439/2802/7304/files/43574640244.pdf
    • https://cdn.shopify.com/s/files/1/0430/0200/3619/files/39729292001.pdf
    • https://cdn.shopify.com/s/files/1/0430/9070/6589/files/70058471689.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/buxigol.pdf
    • https://cdn.shopify.com/s/files/1/0463/0754/1149/files/artistic_sinhala_fonts_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/9132/9173/files/mejemutererizazinemamoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/4161/1159/files/wigamezafonavifixojodos.pdf
    • https://cdn.shopify.com/s/files/1/0431/2553/8970/files/kezul.pdf
    • https://cdn.shopify.com/s/files/1/0434/1386/4602/files/wa600-_3.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007888.bin
65ce741b86ca23c3883a31c8d155cb81b90d8c5662282ea20695bad93f7625be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7888 5072 bytes
font_01_sfnt_off000089d9.bin
2ec00e5e31a0a77d080d92b5849bbaec8d166f7e65185f67367ddf62471d0f48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89D9 10292 bytes

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