Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f7a714046ea0c10…

MALICIOUS

PDF

42.3 KB Created: 2020-08-24 20:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d921c9c5ee097abcaf01cf44f58b7b94 SHA-1: 639611d35e1aed5f5dcfc3f07bf2f0587560ef83 SHA-256: 0f7a714046ea0c100e98590bc3eb0ea3402e20db5b83d1dcf1e2f4b772966e1b
162 Risk Score

Malware Insights

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

The PDF contains a deceptive link that redirects to a known malicious URL, likely as part of a phishing or scam campaign. The document body, though heavily obfuscated, contains references to the malicious URL and numerous other PDF links, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/pify?keyword=autocad+drawing+2d+exercises+pdf
    • http://files.funkychunks.com.au/uploads/1/3/0/7/130738823/lawoxur-dopinunejetipu-xizitusevupad-xogiwesi.pdf
    • http://files.bankfarmlleyn.co.uk/uploads/1/3/1/4/131454190/15bd8133.pdf
    • http://makuri.coloradosoundvision.com/uploads/1/3/0/9/130969723/3905068.pdf
    • http://files.santigrowsolutions.com/uploads/1/3/1/3/131398360/413fb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0350/9911/files/cryptocurrency_trading_strategy.pdf
    • https://cdn.shopify.com/s/files/1/0430/4365/1741/files/green_dragon_runescape.pdf
    • https://cdn.shopify.com/s/files/1/0433/6081/3208/files/wayne_grudem_systematic_theology_free.pdf
    • https://cdn.shopify.com/s/files/1/0440/9065/4870/files/hampton_bay_ceiling_fan_manual_uc7083t.pdf
    • https://cdn.shopify.com/s/files/1/0441/0825/1288/files/61416427341.pdf
    • https://cdn.shopify.com/s/files/1/0433/5871/6055/files/51248865478.pdf
    • https://cdn.shopify.com/s/files/1/0431/5624/2581/files/54218981996.pdf
    • https://cdn.shopify.com/s/files/1/0433/4940/9950/files/sprinkler_irrigation_types.pdf
    • https://cdn.shopify.com/s/files/1/0429/7159/4911/files/wupikamijawi.pdf
    • https://cdn.shopify.com/s/files/1/0428/1748/7011/files/53528135328.pdf
    • https://cdn.shopify.com/s/files/1/0435/1351/2100/files/factor_de_carga_electrica.pdf
    • https://cdn.shopify.com/s/files/1/0430/2041/9226/files/world_almanac_2019.pdf
    • https://cdn.shopify.com/s/files/1/0433/0822/0574/files/23927135518.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_off000065f9.bin
096c1b1b88286ba392c1df1941de17d005c4f57c7518642dbcff877f58c093b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65F9 5572 bytes
font_01_sfnt_off00007918.bin
240de2302838f1c379045b400910866426f3e924af12e1aec23f30d47e790fb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7918 10284 bytes

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