Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e6cc0bc304e7b1…

MALICIOUS

PDF

48.8 KB Created: 2020-08-20 00:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a63c0511a80fe506a7be22c1c4d1586a SHA-1: 2a73cc519225cdf3e89778768ded17ea8229158f SHA-256: 33e6cc0bc304e7b16d2da4823e3356994109a127f09fcf46152253605656018b
162 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=aix+basic+interview+questions+and+answers'. The document body, though heavily obfuscated, contains this same URL, indicating a deliberate attempt to redirect users to a malicious site under the guise of providing interview answers. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=aix+basic+interview+questions+and+answers
    • http://files.3queenspublish.com/uploads/1/3/1/4/131413485/9948788.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9593/2584/files/ukulele_arpeggios.pdf
    • https://cdn.shopify.com/s/files/1/0430/6694/9799/files/19820190041.pdf
    • https://cdn.shopify.com/s/files/1/0433/9977/4366/files/esl_all_about_me_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/6451/7023/files/zazodilujolinaze.pdf
    • https://cdn.shopify.com/s/files/1/0428/9635/9580/files/symbolic_logic_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0437/4449/3720/files/sadawalurabekopokafojijur.pdf
    • https://cdn.shopify.com/s/files/1/0457/4783/0940/files/baby_crib_sheets_at_walmart.pdf
    • https://cdn.shopify.com/s/files/1/0434/6360/6429/files/install_nvidia_driver_ubuntu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8722/4214/files/79127361531.pdf
    • https://cdn.shopify.com/s/files/1/0437/1811/5480/files/hearts_of_iron_3_beginner_s_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/rebaladazapizanenuvuvisi.pdf
    • https://cdn.shopify.com/s/files/1/0428/1466/8959/files/indesign_report_layout.pdf
    • https://cdn.shopify.com/s/files/1/0427/4687/1974/files/76682170338.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_off00007df8.bin
be50cfee5ce0c0e5b2e58dc79b304f15fb4aa7dde103711406fecd22432f9492		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF8 5376 bytes
font_01_sfnt_off00009050.bin
a8cdfdd8964d0b53f9efb9898848ff2502b81d88e895480dbea78518e89f37ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9050 11100 bytes

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