Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e09f75c4e05f076…

MALICIOUS

PDF

49.4 KB Created: 2020-08-07 04:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4c5c75190442379d4f715c0b1b50eb4 SHA-1: ef14ac0d20507a80c0faf76dbfd5035653de40ff SHA-256: 9e09f75c4e05f076e2b2c16d2249242aad9b98795e55bfa6588f41dc7504656a
152 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, includes the target URL and a deceptive title suggesting it's a technical specification. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be luring users to malicious infrastructure via deceptive document 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://ttraff.ru/pify?keyword=is+4894+for+centrifugal+fan+pdf
    • http://files.scoresgrill.ca/uploads/1/3/0/7/130740458/bugopuzibixateg.pdf
    • http://losipuxig.rsllcw.com/uploads/1/3/2/6/132682883/luriwizogage.pdf
    • http://files.klausriis.com/uploads/1/3/0/7/130775853/ce518.pdf
    • http://files.lydiafellowship.org/uploads/1/3/1/4/131438557/d58f3630eefa878.pdf
    • http://files.klausriis.com/uploads/1/3/0/7
    • https://cdn.shopify.com/s/files/1/0432/7679/6057/files/resoxenikejaroxebi.pdf
    • https://cdn.shopify.com/s/files/1/0437/9151/5808/files/tavikak.pdf
    • https://cdn.shopify.com/s/files/1/0433/8778/1276/files/5173488024.pdf
    • https://cdn.shopify.com/s/files/1/0431/0482/9602/files/tefapupupenopuwiji.pdf
    • https://cdn.shopify.com/s/files/1/0434/3067/4597/files/30889501974.pdf
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/55759300014.pdf
    • https://cdn.shopify.com/s/files/1/0432/7188/0870/files/nodemuxogujonav.pdf
    • https://cdn.shopify.com/s/files/1/0430/1311/1961/files/capital_structure_mba_project.pdf
    • https://cdn.shopify.com/s/files/1/0437/0923/5353/files/asciidoc_page_break.pdf
    • https://cdn.shopify.com/s/files/1/0438/4522/2557/files/samsung_bd-_d6500.pdf
    • https://cdn.shopify.com/s/files/1/0437/7201/8845/files/weather_today_bridgeport_wv.pdf
    • https://cdn.shopify.com/s/files/1/0428/1755/2543/files/adventures_of_huckleberry_finn_book.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074b0.bin
72b95566b8a61461bc90345ebef59728d723446302256921220c1522bae5afc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74B0 5580 bytes
font_01_sfnt_off000087ab.bin
de2587e3014eea851f799e127493639eee59e53f947378d4172c84ef34ce78e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87AB 10144 bytes
font_02_sfnt_off0000aa53.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA53 4324 bytes

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