Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3b928fb878eedc…

MALICIOUS

PDF

77.0 KB Created: 2020-10-23 05:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: 520097d344b3ec5760d7bad4ceed1d15 SHA-1: 1f15290678482b016e233351f380d3eb1b142447 SHA-256: 3f3b928fb878eedc2c4c70a63e07e560d5f112b712bc68b66169b591636641ff
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific malicious redirector URL, indicating an attempt to drive traffic to malicious infrastructure. The document body, though heavily obfuscated, contains the malicious URL and references to benign-looking PDF files, likely to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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.cc/123?keyword=the+outsiders+book+vs+movie+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366344/normal_5f870e389d026.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393197/normal_5f90aabf47f15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f870c8ab38f6.pdfIn PDF document text
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/2583b6.pdfIn PDF document text
    • https://foxagizak.weebly.com/uploads/1/3/4/3/134332010/gowuvopaset_zudupebesitif.pdfIn PDF document text
    • https://vixijusodu.weebly.com/uploads/1/3/0/7/130776714/9635404.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/6497588.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/foburadip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0491/7877/1622/files/world_war_z_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7888/4759/files/abcd_2_mp3_song_wapking.cc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8051/4713/files/solexexogoxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3704/0023/files/fikitakuwigowumigevogumat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7bd5edb-ee2b-4b30-8071-f8dea4748b24/tea_bag_poem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c17a45ba-1d73-41fe-80ac-56152139fa4c/62714376596.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2908/5859/files/superior_sprinkler_valve_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3699/7792/files/27183958425.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4902/4669/files/lerarun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8898/4222/files/wealth_x_report_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7612/7394/files/founders_credit_union_membership_requirements.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5018/4085/files/rasinizirusip.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02B 4904 bytes
SHA-256: 58f215c02c247513844342beab3fa4ef3f6c8ab0cc6c9266ef1d01ff242cac7d
font_01_sfnt_off0000f0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E9 11060 bytes
SHA-256: ce613c04bc3fa34189c477ae30b07fa36d0ebe5c58ff1ead0e0b1e49e34b3cf7
font_02_sfnt_off00011665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11665 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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