Malicious PDF — malware analysis report

Static analysis result for SHA-256 89512ef21dd21dc2…

MALICIOUS

PDF

42.8 KB Created: 2020-10-26 09:41:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f2e77f32c13dced167218fb4b966fb87 SHA-1: 852655c698e3557652c263b3e6c3e554f42f78e5 SHA-256: 89512ef21dd21dc2d4c5e6409b27034065aa12f530ba0e8a48d2e209f76a9a23
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying one as a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. This suggests the document is designed to lead users to malicious sites, 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://gettraff.ru/pify?keyword=catabolism+of+protein+pdf In PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/sugigilim-zivodoza-jubirime.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/bbf935c44711.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376099/normal_5f8a12f97d1a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372100/normal_5f923684c9379.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/1/0496/1049/0022/files/57792954085.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/1673/0799/files/97513331893.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/5327/7088/files/20114698336.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5806/8633/files/hersbrucker_hops_profile.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4891/0491/files/lets_just_praise_the_lord_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/xinaketudu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c41c65f2-ef98-4840-be26-662bfb181c23/watchdog_big_dog_sump_pump_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae315ee2-4860-4be0-bbfc-e47bfeb05a4d/narokijojitafexo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1420/7134/files/complex_numbers_examples_and_solutions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3870/2748/files/59371308726.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9929/4363/files/waluzowipagumajadu.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_off000067a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67A4 5232 bytes
SHA-256: 1da93f0ccac18557b639da05bd7d3fc446b6834847511a3611c5ffc536e64ebb
font_01_sfnt_off00007951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7951 10976 bytes
SHA-256: 87886258a587571fe8df34c0a62272d3fd6ea8958ce4b5956f17fdf309da2934

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