Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a6f634e9afebd5…

MALICIOUS

PDF

42.3 KB Created: 2020-08-12 06:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec9004ceaf4a309ab63d56b855d1a00e SHA-1: aab1cd374c084bc68b33a2ded05cb8e6d389fc35 SHA-256: 45a6f634e9afebd544e4bf8964145aa0941d2047d24ac9c95a22f9aeeb9b26c3
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. The primary malicious URL identified is https://ttraff.com/pify?keyword=sample+annotated+bibliography+apa+pdf, which is likely used to deliver a secondary payload or redirect the user to a phishing site. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious redirector attack.

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.com/pify?keyword=sample+annotated+bibliography+apa+pdf
    • http://files.ramblinadventureclub.com/uploads/1/3/0/8/130813781/495262adcd3a5.pdf
    • http://files.briarclifftrails.com/uploads/1/3/1/1/131164176/rumiko.pdf
    • http://files.stinesfitness.com/uploads/1/3/1/6/131637306/8472244.pdf
    • https://cdn.shopify.com/s/files/1/0434/4456/8216/files/th6110d1021_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3876/files/50254234310.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9874/files/83055083324.pdf
    • https://cdn.shopify.com/s/files/1/0433/3705/6414/files/sentence_word_order_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/4744/3865/files/vijojulategikunod.pdf
    • https://cdn.shopify.com/s/files/1/0435/8314/4093/files/22028765155.pdf
    • https://cdn.shopify.com/s/files/1/0435/3510/6203/files/88100501660.pdf
    • https://cdn.shopify.com/s/files/1/0433/0805/6740/files/mudutimuko.pdf
    • https://cdn.shopify.com/s/files/1/0433/5842/1142/files/cadastral_surveying_definition.pdf
    • https://cdn.shopify.com/s/files/1/0432/7096/3366/files/futonugere.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_off000067bf.bin
8ca9d4c0b8c549efd2f7ea15f3f55575eee2783aa02cf65ff96b033cd69b6506
pdf-font-stream PDF embedded font (sfnt) at offset 0x67BF 5620 bytes
font_01_sfnt_off00007aab.bin
131c4773e77e3cf690761f919588fbc5e93c4cf857f98252d5dedf54538b0d0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AAB 9996 bytes