Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb44dfdddce12c69…

MALICIOUS

PDF

49.3 KB Created: 2020-08-04 09:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e58d98402d3e4e6cf72bdd782cb49052 SHA-1: 306c23b8a913e48b177b38aef2d049db9e67b9c7 SHA-256: fb44dfdddce12c695db08458ed02de9e815cb91b4697e819fe0fcf2f3fa36434
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector at 'https://ttraff.ru/pify?keyword=absorcion+atomica+definicion+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector used for phishing or malware delivery.

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=absorcion+atomica+definicion+pdf
    • http://files.unfilteredwithsteveheg.com/uploads/1/3/0/7/130775084/xibekowovixukom.pdf
    • http://files.oldcountryleather.com/uploads/1/3/0/7/130739544/8570615.pdf
    • http://files.fictionvixenbookreview.com/uploads/1/3/1/3/131379395/3961015e0fe9c43.pdf
    • http://files.operationfreedomdogs.com/uploads/1/3/0/9/130969967/mibaxefukeve.pdf
    • https://cdn.shopify.com/s/files/1/0431/5421/0980/files/bibigifipezezi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6893/9672/files/94840098629.pdf
    • https://cdn.shopify.com/s/files/1/0432/2679/2093/files/78197012272.pdf
    • https://cdn.shopify.com/s/files/1/0434/0531/2154/files/pidijutejasi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5072/1699/files/depaxusumudosexozav.pdf
    • https://cdn.shopify.com/s/files/1/0434/0888/3870/files/4256264790.pdf
    • https://cdn.shopify.com/s/files/1/0428/2449/9367/files/negakedowepukaranelev.pdf
    • https://cdn.shopify.com/s/files/1/0431/8766/7104/files/24404234845.pdf
    • https://cdn.shopify.com/s/files/1/0433/4980/3166/files/sigovexumefojumexed.pdf
    • https://cdn.shopify.com/s/files/1/0437/3292/6616/files/26104458221.pdf
    • https://cdn.shopify.com/s/files/1/0431/9415/5169/files/38804262636.pdf
    • https://cdn.shopify.com/s/files/1/0446/7530/1539/files/english_grammar_language_as_human_behavior_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0427/5575/2103/files/wicked_game_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0432/4373/3154/files/sunset_times_2016.pdf
    • https://cdn.shopify.com/s/files/1/0435/3638/4159/files/tuliwisakokesaxuwe.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_off00008387.bin
813c385464ad14b1288beeb8eed8396a5ece4ec9e38708b41e754992c828263c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8387 5396 bytes
font_01_sfnt_off000095c9.bin
889832b7d821489c622dffa11213ca251ab38b5ae46617d48b52c319e6f633ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95C9 9964 bytes

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