Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc80c494ae3adc80…

MALICIOUS

PDF

42.8 KB Created: 2020-09-30 12:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2c3f3b24fd7ba529c8bbc46a7d239037 SHA-1: a528291eff5dffd36d29f331c5cae74932b852b9 SHA-256: dc80c494ae3adc80fd72665d2979e2a18006bdeb6f622ed6db6433c7a955773f
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which are designed to appear as legitimate PDF files hosted on services like mozfiles.com. These links ultimately redirect to a known malicious domain, cctraff.ru, indicating a link farm or redirector attack. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that its primary purpose is to direct users to harmful 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://cctraff.ru/strik?keyword=periodic+table+with+names+and+atomic+mass+and+numbers+pdf In PDF document text
    • https://site-1036910.mozfiles.com/files/1036910/65509477017.pdfIn PDF document text
    • https://site-1037850.mozfiles.com/files/1037850/savuzedirikegewajejuxa.pdfIn PDF document text
    • https://site-1037268.mozfiles.com/files/1037268/tilalidexujenivaxujopoxaw.pdfIn PDF document text
    • https://site-1036743.mozfiles.com/files/1036743/15607528630.pdfIn PDF document text
    • https://site-1036659.mozfiles.com/files/1036659/xalezetomamuwaxemed.pdfIn PDF document text
    • http://fuxid.natteyallockps.com/uploads/1/3/0/8/130874253/7684356.pdfIn PDF document text
    • http://files.theteapotus.com/uploads/1/3/0/7/130775850/bazivolifa.pdfIn PDF document text
    • http://lipar.simply-sound.com/uploads/1/3/0/9/130969489/d89de2f8.pdfIn PDF document text
    • http://files.princealbertchamber.com/uploads/1/3/0/7/130776763/0fb3b.pdfIn PDF document text
    • http://files.carnegiepresby.org/uploads/1/3/0/7/130776521/xetejejosu_nisaguroxig_witubizijajibe.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/1/0436/8583/9003/files/5353695432.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7335/5419/files/enterprise_rent_a_car_telephone_interview_questions_uk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/8094/7614/files/ringtones_telugu_naa_songs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/2444/5603/files/black_friday_movie_hd.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7974/6201/files/fumomimojekuvu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7022/5574/files/sexunokagi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4097/6291/files/12004262056.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6072/6426/files/mizapulegi.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_off0000678f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x678F 5628 bytes
SHA-256: 3cccb5423e6aab85c13219f09b39f9619637a30180ecc72605d37ce0a434d85f
font_01_sfnt_off00007a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A94 10576 bytes
SHA-256: 622ffbec52881aff83a17b90390dd71685bad8f3f8d54b005a3095ba8a6841fd

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