Malicious PDF — malware analysis report

Static analysis result for SHA-256 7358a5aff69b9466…

MALICIOUS

PDF

42.5 KB Created: 2020-08-19 06:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87de8fc61493914f8f2740ab393ad186 SHA-1: f5b083dde76b741385d6b9d954630b920bbf1efc SHA-256: 7358a5aff69b94667084af2e93af14d82148fe0682c64a13e38921b509fe2a2c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL. This suggests an attempt to lure users to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent.

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=kazoo+concerto+sheet+music
    • http://files.booksandmorsels.com/uploads/1/3/1/3/131379928/sobezinezax.pdf
    • http://files.myoffgridpower.com/uploads/1/3/0/8/130874063/5096bb7f8886.pdf
    • http://files.saylorflett.com/uploads/1/3/0/7/130740462/6180337.pdf
    • http://files.mustbefrenchies.com/uploads/1/3/1/0/131070327/senitumunawufobupap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1347/9320/files/83385393381.pdf
    • https://cdn.shopify.com/s/files/1/0433/0350/1989/files/simon_monk_programming_arduino.pdf
    • https://cdn.shopify.com/s/files/1/0438/7468/0987/files/zarapamolefog.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gobobuxewinunegurugita.pdf
    • https://cdn.shopify.com/s/files/1/0429/1562/7175/files/mubuxapelukujomop.pdf
    • https://cdn.shopify.com/s/files/1/0430/0118/4417/files/wujebo.pdf
    • https://cdn.shopify.com/s/files/1/0436/9498/1273/files/cargador_de_baterias_truper_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/4978/8327/files/waxolebanib.pdf
    • https://cdn.shopify.com/s/files/1/0440/1741/8405/files/wixalad.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/83759083977.pdf
    • https://cdn.shopify.com/s/files/1/0431/3061/8011/files/bewenogidugefik.pdf
    • https://cdn.shopify.com/s/files/1/0435/8298/0259/files/98451854744.pdf
    • https://cdn.shopify.com/s/files/1/0431/1518/4295/files/41211144634.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067b3.bin
4bd30d631ed64213574c48ad758248e524a32faf5b393e926fec208f4750aab3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B3 5024 bytes
font_01_sfnt_off000078a7.bin
a55ecaa142988fedd493cbeaaf6702f904675225278987079f91f1736242ebf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78A7 10636 bytes

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