Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b08de318712ca4…

MALICIOUS

PDF

46.7 KB Created: 2020-10-18 04:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 57c4e7d77a5dae3edc878dd14bea1b6d SHA-1: b060cfadbf2f5efd715d3f47841b44661caa2350 SHA-256: a0b08de318712ca4a53501d44a59b1ea887b5411bbf83e9d56cb9c41711d249c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. This suggests the document is part of a link farm or SEO poisoning campaign designed to lure users to malicious sites. The ML classifier also strongly indicated maliciousness.

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.ru/123?keyword=vanguardas+europeias+em+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366308/normal_5f886b7e36711.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379355/normal_5f8b82b87454c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378405/normal_5f8b5c8de429b.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/1/0486/4671/7608/files/morosug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/3091/9326/files/munifigalogejo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5832/6435/files/2462531107.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7905/7056/files/daxuzopibinananifuvefali.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/3916/2005/files/33078650653.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/7481/4620/files/33062317525.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8907/0747/files/jbl_horizon_manuale_istruzioni_italiano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/9685/8531/files/difisili.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6986/5631/files/54713972183.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9572/9333/files/diamond_gusset_jeans_outlet_store.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4522/2557/files/freeway_fury_2_unblocked_at_school.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/8059/6638/files/dictionary_words_that_start_with_lan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9042/0914/files/emotional_intelligence_tests.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c8da69a-0bc1-4a0f-8521-ec2acf584568/78119985781.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e962d70c-8320-4ee3-a353-2e7c12822882/voxap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84319a34-321b-4b28-b4f4-5f4619bd1746/41748488518.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2772fb03-ab81-466f-bdfd-9090e40f13e4/vubenadugoxeforavisav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a8088dd-c50c-46bb-8b2d-888d2594160f/giregepirul.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_off0000743c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x743C 5296 bytes
SHA-256: cf90eb42d45bb14891e3917f4e961c9a27e57dcb1f92ac52eb60d7645cc8a172
font_01_sfnt_off0000862d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x862D 12408 bytes
SHA-256: 1ee21519a2fb6e18c8422ed3ed9ea865d7fee0763eb1a9f79eb12f3c4f914f6b

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