Malicious PDF — malware analysis report

Static analysis result for SHA-256 51508118a3374ef9…

MALICIOUS

PDF

39.9 KB Created: 2020-10-02 10:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 24ea3670794f9c577a5df4afd3a58a0f SHA-1: 6acb82311882bc5b90d1feb3fdd6e3197b6a8798 SHA-256: 51508118a3374ef9c13bacf6bf8f6d9e185b519cdaff91929fabae0b4bc4d697
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links to external PDFs hosted on disposable domains, indicating a link farm or distribution mechanism. One URL, https://cctraff.ru/strik?keyword=redd%2527+s+wicked+black+cherry+calories, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text and URLs, further supporting the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=redd%2527+s+wicked+black+cherry+calories In PDF document text
    • http://xenen.therestthatworks.com/uploads/1/3/0/7/130775683/napawufuzukikif.pdfIn PDF document text
    • http://files.singlevacations.ca/uploads/1/3/0/7/130738534/1b222.pdfIn PDF document text
    • http://files.carolinegriffiths.net/uploads/1/3/1/3/131384127/xetiwesopovixa.pdfIn PDF document text
    • http://fugitep.edengrau.com/uploads/1/3/1/4/131452976/6746951.pdfIn PDF document text
    • http://dimaz.jeremydhoward.com/uploads/1/3/1/4/131453541/kobero.pdfIn PDF document text
    • https://site-1038432.mozfiles.com/files/1038432/91612798304.pdfIn PDF document text
    • https://site-1036818.mozfiles.com/files/1036818/38272721693.pdfIn PDF document text
    • https://site-1036659.mozfiles.com/files/1036659/17043638659.pdfIn PDF document text
    • https://site-1036958.mozfiles.com/files/1036958/jadukudepulurulavo.pdfIn PDF document text
    • https://site-1037193.mozfiles.com/files/1037193/lawojiwabamu.pdfIn PDF document text
    • https://site-1036633.mozfiles.com/files/1036633/lobitataraxopolim.pdfIn PDF document text
    • https://site-1037071.mozfiles.com/files/1037071/80952463140.pdfIn PDF document text
    • https://site-1036637.mozfiles.com/files/1036637/11998348495.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/1/0432/9000/1572/files/tamabipafudutodimone.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9964/4314/files/wutufizaxoluriku.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_off000051ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51EC 5468 bytes
SHA-256: ea2f543268a38511372ea4a854a22947632ccc30285f51aebbc0d7208bce683b
font_01_sfnt_off0000649f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x649F 1940 bytes
SHA-256: c5826c68d5841b739a4cef6a355105b0a64a7eaca563b864f03d3242b29b72c3
font_02_sfnt_off00006dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD7 10936 bytes
SHA-256: 7f185d484a2ece3563142fa4f210bcc405082cf688eea38173c8b99100343062

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