Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43adecbb241de8c…

MALICIOUS

PDF

41.4 KB Created: 2020-08-14 03:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb53e6f2065b9e09c4cb4358f6e46c14 SHA-1: 29d7849b61e85d2189849163b12f83635ab7cdd9 SHA-256: f43adecbb241de8c135f23e23aeeea8a6a97eb21505461c27b9696a50030b737
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded external links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting an attempt to manipulate search engine results or distribute spam. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the primary attack vector appears to be the malicious redirection links.

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=atelier+meruru+endings+guide
    • http://losaren.tiaravbeauty.com/uploads/1/3/1/3/131379179/5b7a767c1.pdf
    • http://niponoji.ortigroupltd.com/uploads/1/3/1/8/131856827/8970299.pdf
    • http://files.bizeecatz.com.au/uploads/1/3/1/3/131381067/6967683.pdf
    • http://lixaref.rmwle.org/uploads/1/3/2/6/132681579/fuwuzilofiledopu.pdf
    • https://cdn.shopify.com/s/files/1/0437/4003/7271/files/xijojulinisilagabi.pdf
    • https://cdn.shopify.com/s/files/1/0443/2812/4572/files/60829709458.pdf
    • https://cdn.shopify.com/s/files/1/0427/8140/9436/files/26108200448.pdf
    • https://cdn.shopify.com/s/files/1/0431/4031/7335/files/80054221022.pdf
    • https://cdn.shopify.com/s/files/1/0434/1304/5398/files/superior_drummer_2_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0432/1751/8751/files/bubexizexil.pdf
    • https://cdn.shopify.com/s/files/1/0429/6838/3642/files/ccrt_culture_notes_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/0056/9751/files/wigipuwaxajoxeposesebikel.pdf
    • https://cdn.shopify.com/s/files/1/0430/3768/7962/files/18774483356.pdf
    • https://cdn.shopify.com/s/files/1/0434/1488/0405/files/xumirup.pdf
    • https://cdn.shopify.com/s/files/1/0435/1482/2811/files/dexebidoxaluxelal.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/79157206586.pdf
    • https://cdn.shopify.com/s/files/1/0429/2496/6044/files/south_park_season_22_episode_guide.pdf
    • https://cdn.shopify.com/s/files/1/0440/8092/2789/files/tdm_cars_gmod.pdf
    • https://cdn.shopify.com/s/files/1/0432/6427/8686/files/who_is_chris_pine_s_grandmother.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/
    • https://cdn.shopify.com/s/files/1/0429/2496/6044/files/south_park_season_22_episode_gui

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064a4.bin
6efaceb3468e0f4a397d1f870be3222076fefd0982474708b784c3bfef336ce1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64A4 4924 bytes
font_01_sfnt_off00007543.bin
1e9e01cbcd928990673143353162ac120d190161a5f7b7cedbc1e4f9a5044024		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7543 10192 bytes

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