Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d648c6a494ebff…

MALICIOUS

PDF

56.8 KB Created: 2020-10-11 16:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 53b4391f9654a376ff27df5cc7dd398d SHA-1: 1e592a47d6f70015db2ecc6666875e821edf142c SHA-256: 16d648c6a494ebff2e2b07ddacab52d25471003520df1b1df4cddb4e6b777cf9
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, pointing to various PDF documents. One of these links, 'https://ggtraff.ru/strik?keyword=istmo+de+tehuantepec+gastronomia', is flagged as a malicious redirector. The presence of numerous links and the malicious redirector suggest an attempt to manipulate search engine rankings or distribute malicious content.

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://ggtraff.ru/strik?keyword=istmo+de+tehuantepec+gastronomia In PDF document text
    • http://files.envivere.com/uploads/1/3/1/4/131452967/pedas-deripimex.pdfIn PDF document text
    • http://files.jennygodley.com/uploads/1/3/1/0/131070457/8012706.pdfIn PDF document text
    • http://files.imural.ca/uploads/1/3/0/7/130775658/punilasofojamib.pdfIn PDF document text
    • http://files.pinnaclemountainphotography.com/uploads/1/3/0/8/130873708/6193030.pdfIn PDF document text
    • http://nuvozox.lindsaylin.com/uploads/1/3/1/3/131380001/4347224.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/1/0486/1915/9717/files/12397874327.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2674/6024/files/71957791502.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7513/2824/files/what_is_the_doctrine_of_dual_federalism.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3159/2102/files/29687506799.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2486/2365/files/old_navy_backpacks_for_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63a0a47c-946f-4116-b2eb-e5ab579efe67/3383392291.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99a2f9e2-7433-427f-a634-56cc9f16a01a/56040488624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c53b2df8-beb1-4f38-ac45-11f034ea9a87/48405751576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55a1740a-5e25-4872-9c04-93392d02cd1f/wesitif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0722da09-3804-4ce3-bd0a-ce804aa83a2e/61710830504.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0164a27-fc09-4807-a476-f2e876bd8e3d/sedek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4495eb8a-5372-4bed-942f-28e93a69685c/68524603086.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/063d1598-d990-434f-9ffb-91300d131737/560523844.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d66219d1-dff0-47b2-92e9-0653fb51c5d7/jegaxijanimizafe.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_off00009933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9933 5392 bytes
SHA-256: beb194de5b5cb960c6b50275b7cdb027f94a12efa9daef6c99acc1e50dbb6714
font_01_sfnt_off0000ab5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB5D 13412 bytes
SHA-256: aab43e10e9008bdf746d8266904527a4d801314324d4cd684c02d71ed904c19a

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