Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81b600bc77f56b1…

MALICIOUS

PDF

35.3 KB Created: 2020-11-02 00:19:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2c8305035f69b19fa5fe034e310ee6ad SHA-1: 3aa5e80c6394aff34291b8ba2b7672555ca654da SHA-256: c81b600bc77f56b1849dd2ade5c6da357d50c4f5ba9585c0630e277e41122b14
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains embedded links that lead to known malicious redirector infrastructure and a large number of external links, characteristic of SEO link farming. The document body, though heavily obfuscated, contains text that appears to be a lure for an LG product manual. The ML classifier also flagged this PDF as malicious with high confidence.

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/123?keyword=lg+ac+lp0910wnr+manual In PDF document text
    • https://munizifazu.weebly.com/uploads/1/3/4/3/134354015/a9bd4334f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420468/normal_5f9983ffd8383.pdfIn PDF document text
    • https://busozovamifolak.weebly.com/uploads/1/3/4/2/134235369/13ad561ad16a.pdfIn PDF document text
    • https://disadaniti.weebly.com/uploads/1/3/4/4/134463451/f57976.pdfIn PDF document text
    • https://feloxoxux.weebly.com/uploads/1/3/4/0/134000485/valovobuxipid-masikit.pdfIn PDF document text
    • https://waxusebodik.weebly.com/uploads/1/3/4/5/134529962/aa8823bf.pdfIn PDF document text
    • https://kazigujexumakul.weebly.com/uploads/1/3/4/3/134320364/6703855.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2cf3a5f-c41d-4415-a91d-ba20bf4e3aea/dudidurolopiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/545909c6-cb67-4551-be9d-6a4dca417987/40691220251.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0037f080-2c04-44fb-8690-b35c211b463b/12524075522.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75fe90bc-bab1-4d8d-a9ff-8bc57761e9fd/74203905959.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3925ba6d-1eef-4c3f-adc2-7793aacea186/48769407981.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d8bd52e-d423-4058-9dd7-9885d7b24463/fexeviwodud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d6e3897-65c7-405c-b997-e5ddefed0118/chut_nhn_n_c_bao_lu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adbeb18b-02b5-4afc-90cf-87c01be767d5/40473333610.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e134cb03-ad85-4ac2-8958-7f721f36997c/22457441936.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_off00004b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B57 5456 bytes
SHA-256: ff7753b011cad649e613eed96ccc489cde2555052cbe812e6ec545c03aa8464b
font_01_sfnt_off00005df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF8 10176 bytes
SHA-256: 999afcae4e6dc1538e992d064c1efbaa100a0cf05f46a3af7cbf625eae97f7e4

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