Malicious PDF — malware analysis report

Static analysis result for SHA-256 f08737246236a684…

MALICIOUS

PDF

45.6 KB Created: 2020-08-12 06:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7c7500249b6370799e0b0b72eae818a SHA-1: 5069331509f54df4ddd37b6ef9d97a80b17e89f9 SHA-256: f08737246236a68465bfb3805ed12bfa4409d190fbc852d0ecf0f38e4e30bb55
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors, as indicated by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The document body, though partially corrupted, contains text related to 'remove blank page pdf online' and includes the malicious redirector URL, suggesting a lure to trick users into visiting potentially harmful sites. 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=remove+blank+page+pdf+online
    • http://files.westernaustralianshepherdrescue.com/uploads/1/3/1/0/131071167/1509568.pdf
    • http://wewuge.yougetstrategic.com/uploads/1/3/0/8/130814124/koguz.pdf
    • http://files.metricmfg.com/uploads/1/3/0/7/130740412/4807080.pdf
    • http://togowibet.manringmasterpiece.com/uploads/1/3/0/7/130776738/jireturezodew-zijum-motava-worave.pdf
    • http://files.nokillhuntsville.com/uploads/1/3/1/4/131455883/jalupi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8098/2434/files/sulagovelutiwojefululudi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5238/3904/files/wdc_smartware_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/6067/4210/files/pdf_accessibility_checker_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/benign_paroxysmal_positional_vertigo_home_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8359/files/69373056486.pdf
    • https://cdn.shopify.com/s/files/1/0433/0926/9156/files/dipafawi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7539/3946/files/kaleshwaram_project_map.pdf
    • https://cdn.shopify.com/s/files/1/0433/6032/1691/files/80252090665.pdf
    • https://cdn.shopify.com/s/files/1/0432/0644/3163/files/34524723205.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/libuzab.pdf
    • https://cdn.shopify.com/s/files/1/0432/7273/2836/files/gefilovamesove.pdf
    • https://cdn.shopify.com/s/files/1/0432/2322/0392/files/47326682218.pdf
    • https://cdn.shopify.com/s/files/1/0440/2728/1558/files/brown_eyed_girl_meaning.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_off000075cc.bin
98d1248dcff1960eedbfd6b6afc0a70789d63e9004f46d4afad702e60d7a939e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75CC 5360 bytes
font_01_sfnt_off00008806.bin
ed11365f09e92b4fecdbdb76923291dd8f3a68e39b39a8950da8e7190020c65e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8806 9860 bytes

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