Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5f11dfec0bf0f3d…

MALICIOUS

PDF

34.0 KB Created: 2020-08-29 15:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e8467e30dd26e98270ecb08e1c56cc1 SHA-1: b46cc57c5b4837a072082e2c73b1e443d1733867 SHA-256: e5f11dfec0bf0f3db99f721615843993daba9f5fc526fc9c92bba347c7d2f152
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, also contains the malicious URL. The presence of numerous links, many pointing to Shopify, suggests a link farm used for SEO poisoning to lure users to malicious sites. The ML classifier strongly indicated maliciousness.

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.ru/wix?keyword=cemal+safi+kitaplar%25C4%25B1+pdf
    • https://cdn.shopify.com/s/files/1/0428/4229/2390/files/rivabosurowemogoxazaletex.pdf
    • https://cdn.shopify.com/s/files/1/0449/6611/7544/files/administrative_management_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0433/3705/6414/files/sheet_metal_guillotine_for_sale_australia.pdf
    • https://cdn.shopify.com/s/files/1/0430/4453/6473/files/security_consultant_business_plan_template.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/39000786981.pdf
    • https://cdn.shopify.com/s/files/1/0429/9898/8949/files/burglar_alarm_circuit_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0429/2503/1587/files/novas.pdf
    • https://cdn.shopify.com/s/files/1/0434/0930/9848/files/nhl_hitz_2002.pdf
    • https://static.usrfiles.com/ugd/b8c837_099671c5ae57404089b03ba1e40a932b.pdf
    • https://static.usrfiles.com/ugd/a2e20a_56544e3a370c41e083e3728fc4f48f0e.pdf
    • https://static.usrfiles.com/ugd/05900a_591f7a61f8fe46e388618feb3b7a7dd9.pdf
    • https://cdn.shopify.com/s/files/1/0435/6725/1615/files/38912819752.pdf
    • https://cdn.shopify.com/s/files/1/0434/6544/1430/files/gijugumukamuwekanogole.pdf
    • https://cdn.shopify.com/s/files/1/0432/5310/4790/files/kebamuwevunoke.pdf
    • https://cdn.shopify.com/s/files/1/0430/8054/8505/files/consecuencias_del_embarazo_adolescente.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000045ff.bin
d3902727ec613b81e2243292845434ab730333331b815ad30ff69fa6c1c7156f
pdf-font-stream PDF embedded font (sfnt) at offset 0x45FF 5188 bytes
font_01_sfnt_off00005787.bin
102f798e5370200249f3e8385e2a9025fd5b1367f1e5bf4919324ddbf3c45999
pdf-font-stream PDF embedded font (sfnt) at offset 0x5787 10876 bytes