Malicious PDF — malware analysis report

Static analysis result for SHA-256 e573b454e42a4623…

MALICIOUS

PDF

39.4 KB Created: 2020-10-03 10:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: a43258a44a376a16cd3a0d38b7ccee16 SHA-1: a89c1971d9d19752f655be1bd274bb26f3cd34b1 SHA-256: e573b454e42a4623b7f68b4eb052abf4bb9939d3bd4d0482d712a0fb97cddaf7
234 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://gettraff.ru/strik?keyword=microsoft+acpi+compliant+control+method+battery+update In PDF document text
    • https://site-1041413.mozfiles.com/files/1041413/38567876768.pdfIn PDF document text
    • https://site-1036681.mozfiles.com/files/1036681/62862538329.pdfIn PDF document text
    • https://site-1036958.mozfiles.com/files/1036958/75371157504.pdfIn PDF document text
    • https://site-1037188.mozfiles.com/files/1037188/ketalimuj.pdfIn PDF document text
    • https://site-1036656.mozfiles.com/files/1036656/gokopoguwufuwoluduli.pdfIn PDF document text
    • http://tefowuro.harveyrpeck.net/uploads/1/3/1/4/131407736/mebiwuso.pdfIn PDF document text
    • http://files.bodyandsoulapothecary.com/uploads/1/3/2/6/132696018/9132033.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/5366/5442/files/zatarains_jambalaya_mix_instant_pot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7301/0845/files/duwapo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7152/0411/files/71070406966.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3429/1609/files/muscles_used_in_respiration_during_exercise.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4691/0624/files/27540078522.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3887/9143/files/mortal_kombat_x_guide_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9073/9361/files/meguki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/55097971777.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A69 5644 bytes
SHA-256: a8af73ada62cdae71f8e665db151edb0d3fde0f17afb4e3260164f89da604f32
font_01_sfnt_off00006d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D7D 10248 bytes
SHA-256: ae6d1d379a7281de561ccb0786d877bd250d45473725f58212bb8bf375c232e8

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