Malicious PDF — malware analysis report

Static analysis result for SHA-256 e22eb77f9980011f…

MALICIOUS

PDF

45.5 KB Created: 2020-08-08 23:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f78f87dea1b5a9a15fb09e37001a7a82 SHA-1: 21deab41c47dd3eea13457f4389b31b396b57144 SHA-256: e22eb77f9980011f454b041fb6834093ccf92b91e650bf716c661f243d4f3721
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with one heuristic specifically identifying it as a PDF link farm. The primary malicious URL, https://ttraff.cc/pify?keyword=el+anarquismo+en+argentina+pdf, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and URLs, suggesting an attempt to disguise its malicious nature.

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.cc/pify?keyword=el+anarquismo+en+argentina+pdf
    • http://files.losandermagicllc.com/uploads/1/3/2/3/132303314/tukikekonu.pdf
    • http://files.pilotmarketing.net/uploads/1/3/0/8/130814466/vugegodikufivu.pdf
    • http://files.inspireauthenticity.net/uploads/1/3/0/7/130739480/robixizonuvupog_xivapevokela.pdf
    • http://files.reikinaturalhealingus.com/uploads/1/3/1/3/131381078/nunesiludezejani.pdf
    • https://cdn.shopify.com/s/files/1/0433/6150/1336/files/pedogumojesijibekurivud.pdf
    • https://cdn.shopify.com/s/files/1/0431/5689/7947/files/13870013119.pdf
    • https://cdn.shopify.com/s/files/1/0438/3126/3394/files/installation_des_cameras_de_surveillance.pdf
    • https://cdn.shopify.com/s/files/1/0430/5122/1146/files/himnario_cantos_espirituales.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/quantitative_aptitude_tricks_and_tips.pdf
    • https://cdn.shopify.com/s/files/1/0430/8143/3242/files/68994888120.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/relusadojumoleba.pdf
    • https://cdn.shopify.com/s/files/1/0432/1814/1347/files/bepalajufomadodedokipov.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/26450106566.pdf
    • https://cdn.shopify.com/s/files/1/0437/7971/9317/files/belovefisuwuroridida.pdf
    • https://cdn.shopify.com/s/files/1/0431/0804/0853/files/sameva.pdf
    • https://cdn.shopify.com/s/files/1/0432/4635/4594/files/75602651058.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_off0000700a.bin
de8bc6e9614294893d3f4ab05212c7622d9de8d36d803d253d5dc957bffd7a8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x700A 5444 bytes
font_01_sfnt_off00008275.bin
bf6bdb091dfab89f622d12b9347204bc8b8484d70dff7f585bd1be249c5ef471
pdf-font-stream PDF embedded font (sfnt) at offset 0x8275 11316 bytes