Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ecd946d2a81640…

MALICIOUS

PDF

36.7 KB Created: 2020-08-27 20:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b196f547f1db64a362a9afcc7310920 SHA-1: 3c97bb904cf9b9d43c73d00ac869d2dafb98ff80 SHA-256: 90ecd946d2a81640f73f31c7b3bd9845725de46857aafb4b083d4bea83d75da1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector. The document body, though obfuscated, contains the text 'Rii keyboard manual' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier strongly indicates maliciousness, and the presence of a redirector points to a phishing or malware distribution attempt.

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.me/pify?keyword=rii+keyboard+manual
    • http://files.vancouverislandpremiumhardcandy.com/uploads/1/3/0/7/130740044/ninirovowabubu.pdf
    • http://wemifi.rosinakhan.com/uploads/1/3/1/0/131070197/mivisuzumurule_wakalolapeje_bonadoxe.pdf
    • http://files.cavway.com/uploads/1/3/2/6/132681296/sodazoruzovazu-wopibis-fimon.pdf
    • http://files.3plimited.com/uploads/1/3/0/7/130776790/c75de77f.pdf
    • https://cdn.shopify.com/s/files/1/0441/4462/3768/files/75723826076.pdf
    • https://cdn.shopify.com/s/files/1/0439/2642/1672/files/nixenotukufavorikafes.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4754/files/sapoko.pdf
    • https://cdn.shopify.com/s/files/1/0435/8576/5533/files/porapeva.pdf
    • https://cdn.shopify.com/s/files/1/0432/3550/8387/files/27218770705.pdf
    • https://cdn.shopify.com/s/files/1/0444/0460/5094/files/possessivpronomen_a1.pdf
    • https://cdn.shopify.com/s/files/1/0448/0575/0946/files/fraud_examiners_manual_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/9728/5027/files/libri_per_bambini_in_spagnolo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/78789404223.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7957/files/17472313770.pdf
    • https://cdn.shopify.com/s/files/1/0429/5933/9679/files/appcompatedittext_android_example.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vazakiliduvapi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4076/7132/files/jang_newspaper_25_august_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0444/0319/6070/files/typing_speed_test_aoeu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tugogesobiwem.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_off000047cf.bin
8d9667543ba5015f8ca7609469c5c25c6402e9f38259d0a92e31c20b940d9698		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47CF 4908 bytes
font_01_sfnt_off00005857.bin
f28841fe23923e350c45bf9dd1f109e0904e42398530a31ec694131e6181dcc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5857 9348 bytes
font_02_sfnt_off0000780d.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x780D 4324 bytes

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