Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b74dd9fda002f5…

MALICIOUS

PDF

57.3 KB Created: 2020-10-08 18:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 99bdb2531f85837cb68b7257563c41bc SHA-1: 026587218d268f52e08db80225791a0f0aa6a89e SHA-256: a2b74dd9fda002f5708ae38ec0b6483c1d4dceac6d546b5ef89792612b250833
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://cctraff.ru/strik?keyword=tsr+marvel+super+heroes+pdf In 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://uploads.strikinglycdn.com/files/22664034-26c8-4ca7-a154-8d012ff3cf51/tiwefasajufenezevis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39e960ec-dd8a-4bcb-bd13-1b9848ffbf23/49267008392.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a348d375-b3a7-424b-aa67-32df6eb5235d/44454048576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e984030-15cc-45d7-b564-454b204ca8f3/nejojenotadobafabubexurat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6577e8c-3658-4f0f-a1b2-af8da8999048/82964136385.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d03279f6-4c81-4045-aa10-775819b39922/82096065381.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be0dc1d9-2bce-4a46-b267-618b3d0043ad/safonavajomogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b299224a-dcc9-48bb-abf4-8ba2f203a2c5/rozenipojazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d10d83a9-bc62-433e-be22-286691cb78f2/12637297614.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3365/7498/files/sonic_adventure_2_battle_chao_personality_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6899/2935/files/12190507941.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/8785/9354/files/2553631140.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/0501/2898/files/pfister_shower_head_reviews.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9151/5797/files/kanatuvatajolejazogejolam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8935/3109/files/sncl2_shape_and_bond_angle.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0394/7426/files/tozigata.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/5753/2065/files/dragon_ball_shenron_figure.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8316/0983/files/41958240579.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000998e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x998E 4940 bytes
SHA-256: 5767da97895e81356a1334f65dfc1d8081e7735e94887e13088f4c3ed147f416
font_01_sfnt_off0000aa59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA59 10804 bytes
SHA-256: 5a383332e97e1d2b54309a7a2210489287e602a20d776a6883938334a4f24438
font_02_sfnt_off0000ceba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBA 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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