Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7b681c1755945a…

MALICIOUS

PDF

57.8 KB Created: 2020-10-06 19:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f08ee9974bc22daa136600fd38e11dab SHA-1: 7a840b4e6aa1851dbbe69dc98a8abc6345422638 SHA-256: 1c7b681c1755945ae9939cf9e94b9eaf9f95d35f3b2abb905b6243402e570824
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to disposable domains. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains URLs similar to those found in the link farm. This suggests the primary purpose is to redirect users to malicious content or engage in SEO manipulation.

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://ttraff.club/pify?keyword=fear+the+darkness+guide+mission+10 In PDF document text
    • http://xibopupub.whiteshellcommunityclub.ca/uploads/1/3/2/6/132681910/gekavadutipil.pdfIn PDF document text
    • http://files.masonsmine.com/uploads/1/3/0/8/130873930/1b571a50888d38.pdfIn PDF document text
    • http://bulabak.iewad.org/uploads/1/3/1/4/131453540/9203477.pdfIn PDF document text
    • http://files.glospeycomputers.com/uploads/1/3/0/7/130739169/zixegoribuv_tulaxisoxavef_zolonu_vekuxerad.pdfIn PDF document text
    • http://zajasesoz.witnwords.com/uploads/1/3/1/0/131069934/selikisepefevela.pdfIn PDF document text
    • https://site-1038599.mozfiles.com/files/1038599/laweronotidakodinesogudax.pdfIn PDF document text
    • https://site-1038331.mozfiles.com/files/1038331/pozejemelakana.pdfIn PDF document text
    • https://site-1044115.mozfiles.com/files/1044115/minarefaxexe.pdfIn PDF document text
    • https://site-1037091.mozfiles.com/files/1037091/96978654126.pdfIn PDF document text
    • https://site-1037003.mozfiles.com/files/1037003/jilutufefedumexarijajir.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/1/0479/9895/9769/files/68649209928.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9857/8847/files/bunker_alfa_code_today_2020_august.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8645 5420 bytes
SHA-256: 1495cf399df85d392b3c0b7a9c4b54e16e806a0fe3dd09563e1b2943b0ec8dfc
font_01_sfnt_off00009888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9888 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0000a116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA116 10244 bytes
SHA-256: c9dc23d3b55b68e8c90e8564a2b4c41461fb96fb45d37fdaa40cc32dd8f2dc45
font_03_sfnt_off0000c44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44C 16340 bytes
SHA-256: ee51351c9eb8c6a9dbff1bb743467f39bbaa64eee970481c040e8f02c1ffc4b8

Open this report in the interactive analyzer, or submit your own file for analysis.