Malicious PDF — malware analysis report

Static analysis result for SHA-256 035878fa8f8ffac7…

MALICIOUS

PDF

41.4 KB Created: 2020-08-26 16:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c135124521e15cfbb32656f168f66ddd SHA-1: 5f4a340dd1f4ba6a372786fd2ff864ed0246e95d SHA-256: 035878fa8f8ffac72c25d4ba36c8d514808f5f07feea84d342164f10d663acde
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a mass external link farm, with one URL pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious URL, suggesting an attempt to lure the user to a potentially harmful site for phishing or other malicious activities.

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://ttraff.club/pify?keyword=cancion+parisina+acordeones
    • http://files.finalmile.ink/uploads/1/3/0/8/130814605/787699.pdf
    • http://files.tcfa.org/uploads/1/3/1/3/131383698/6423616.pdf
    • http://files.lillianchun.com/uploads/1/3/1/3/131383791/kufefonat.pdf
    • http://bogew.barcfriends.com/uploads/1/3/0/9/130969264/363dbad.pdf
    • http://files.treeoflifeinternationalchurches.org/uploads/1/3/1/4/131406153/takelodezex_wasejejuvu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/2342/3912/files/zuxowinojinigiwoboponas.pdf
    • https://cdn.shopify.com/s/files/1/0432/8525/0216/files/fanuc_rj3_controller_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mojarugalemidim.pdf
    • https://cdn.shopify.com/s/files/1/0434/4807/4405/files/xixefivowugemodunakakol.pdf
    • https://cdn.shopify.com/s/files/1/0428/2161/5775/files/25944852421.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/ditizujewixomavazo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31321710084.pdf
    • https://cdn.shopify.com/s/files/1/0431/8789/6488/files/wimuzulazawadu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3287/0044/files/35122448464.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/gotovojabekoje.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000662c.bin
27a01e1b0d86181120f5932be9deb36e8bf327c27e73cfab684454cd1a1b257c
pdf-font-stream PDF embedded font (sfnt) at offset 0x662C 4940 bytes
font_01_sfnt_off000076f8.bin
40d51426936d15eb6c4cf4762b03b36cb37882e95333c42f45411a283b2f7883
pdf-font-stream PDF embedded font (sfnt) at offset 0x76F8 9876 bytes