Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc1b86efaedde13…

MALICIOUS

PDF

44.2 KB Created: 2020-09-02 15:41:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db27b205fc0b9c7e363c584ab5ca49e0 SHA-1: f0bb108496b5f844f93df0105ef7786111f15eeb SHA-256: 1dc1b86efaedde1399215bd4e12ffcb1cd6fc484f518d2b7bdc28fd76c2b574b
152 Risk Score

Malware Insights

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

The PDF contains a prominent link disguised as a software download, which is a common social engineering tactic. This link redirects to a known malicious domain. The PDF also contains a large number of other links, many hosted on cdn.shopify.com, suggesting a link farm or SEO poisoning attempt to increase visibility of the malicious content. 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=software+audacity+for+windows+7+free
    • https://cdn.shopify.com/s/files/1/0433/5301/4423/files/candy_luke_davies.pdf
    • https://cdn.shopify.com/s/files/1/0440/9258/8184/files/dopexijotamebeladisoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/4062/8133/files/mastering_anatomy_and_physiology.pdf
    • https://cdn.shopify.com/s/files/1/0431/4310/2618/files/kedire.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tikifulodu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8543/8884/files/30294361092.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3640/files/envision_math_2._0_grade_4_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0435/1108/7259/files/bimejamudutugerikatexajaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/9535/9642/files/dazakegolagigo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9635/8565/files/18987371310.pdf
    • https://cdn.shopify.com/s/files/1/0437/8073/5138/files/billboard_music_awards_performers_schedule.pdf
    • https://cdn.shopify.com/s/files/1/0435/1252/9055/files/96810522772.pdf
    • https://cdn.shopify.com/s/files/1/0439/4326/4411/files/82242869836.pdf
    • https://cdn.shopify.com/s/files/1/0437/7945/7173/files/acuerdos_internacionales_del_medio_ambiente.pdf
    • https://cdn.shopify.com/s/files/1/0431/6587/6390/files/85382539684.pdf
    • https://cdn.shopify.com/s/files/1/0454/9804/0472/files/cds_exam_full_syllabus.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_off00006e7f.bin
e495c3421e20676bfb780dbdffd79d48a8ffae7653c43bd08c4704075e1a60d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E7F 5360 bytes
font_01_sfnt_off000080ee.bin
cda71c7132b51a84a753046eb0cd4d7f4f770e19ad16c9b91a6fe5e28bc3677a
pdf-font-stream PDF embedded font (sfnt) at offset 0x80EE 10424 bytes