Malicious PDF — malware analysis report

Static analysis result for SHA-256 09dceabcbc9693b1…

MALICIOUS

PDF

54.0 KB Created: 2020-08-08 21:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28f124896e1c3ae775e38851dd3feee4 SHA-1: 21bf65a076fc218a23ed60844a0d17ceea2f559f SHA-256: 09dceabcbc9693b13734cefb955571730db3f1c43b1116ac082f81a52a8958e0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'syllabus download' and a URL that matches the malicious redirector. This suggests a phishing attempt to trick users into visiting malicious sites.

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=rrb+alp+syllabus+pdf+download+sarkari+result
    • http://files.addressphonelist.com/uploads/1/3/1/4/131437689/8864107.pdf
    • http://files.lafayette-school.org/uploads/1/3/2/7/132741389/gufonamoj.pdf
    • http://wanime.hetztronics.co.uk/uploads/1/3/1/4/131437812/rebuwojibel-bilibedasuvafuz-lufopijuxu-bobevebodu.pdf
    • http://files.thetruthsayerswoodstock.com/uploads/1/3/0/7/130740571/2097480.pdf
    • http://files.noreeneddy.net/uploads/1/3/1/3/131378852/8315311.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0432/4461/7885/files/pejageluwipedi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1480/files/kuzisobekobadipan.pdf
    • https://cdn.shopify.com/s/files/1/0431/6810/4602/files/nursery_school_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0427/4506/9724/files/vuvafinoxotekel.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/medidebororun.pdf
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/bachianas_brasileiras_no._5_ria_cantilena.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5314/files/lonozilaxidagevav.pdf
    • https://cdn.shopify.com/s/files/1/0429/1536/5031/files/protected_areas.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/godikuka.pdf
    • https://cdn.shopify.com/s/files/1/0430/9024/7829/files/rafutebimoxesamavujopako.pdf
    • https://cdn.shopify.com/s/files/1/0431/2721/0144/files/call_center_script.pdf
    • https://cdn.shopify.com/s/files/1/0440/6876/5848/files/lizotegiwepe.pdf
    • https://cdn.shopify.com/s/files/1/0429/3813/8783/files/how_to_find_bearing_number.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007884.bin
263e1a17e8704c9d60f08a9b877c0b3290c74a4472731b65c0e38767fa2f3b5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7884 5440 bytes
font_01_sfnt_off00008b2d.bin
abf292d53b74c357d6d61c3b47ef9c149f9f2bab85ae52c6886666562f6d98fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B2D 14932 bytes
font_02_sfnt_off0000b8b2.bin
9a547b8cfa28d90422a1b9cf4a15ffc3a7554417a1c6c13342188f6cc84e6e70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B2 4760 bytes

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