Malicious PDF — malware analysis report

Static analysis result for SHA-256 188e1ea70454e194…

MALICIOUS

PDF

41.7 KB Created: 2020-08-31 22:39:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24d3f0d659001cfb18fe1621432b508d SHA-1: eaabb64c8307043da337a56e2d958bb3d268f871 SHA-256: 188e1ea70454e194e22c624155124c1fb15c7d7ba5b9e7b8d50608b34b543f80
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that point to a malicious redirector, disguised with keywords related to 'facebook auto liker android app'. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the primary malicious URL and several other URLs that appear to be part of a link farm, suggesting an attempt to drive traffic to malicious infrastructure.

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/wix?keyword=facebook+auto+liker+android+app
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5335/0055/files/47716688177.pdf
    • https://cdn.shopify.com/s/files/1/0429/2247/5687/files/xugobulusamifofole.pdf
    • https://cdn.shopify.com/s/files/1/0437/7850/6904/files/89986334329.pdf
    • https://static.usrfiles.com/ugd/09273f_113a8fcb195c4b06b4a8dc05d8eff5d6.pdf
    • https://static.usrfiles.com/ugd/067ecb_95a25567a62b419283153219d0423da6.pdf
    • https://cdn.shopify.com/s/files/1/0450/4797/1990/files/excel_data_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/2795/4854/files/rannar_boi_in_bengali_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/4011/8683/files/tajetij.pdf
    • https://cdn.shopify.com/s/files/1/0439/6548/1118/files/design_of_asynchronous_sequential_circuits.pdf
    • https://cdn.shopify.com/s/files/1/0440/7663/0181/files/aprendizajes_clave_geografa_secundaria.pdf
    • https://cdn.shopify.com/s/files/1/0435/1374/1472/files/winasenixurox.pdf
    • https://cdn.shopify.com/s/files/1/0432/0886/8008/files/40489254021.pdf
    • https://cdn.shopify.com/s/files/1/0437/7457/4749/files/whatsapp_video_free_2018.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_off00006376.bin
13b8f4cf41f65f0e3d3f6ddcad1290d00fe2b7da1085c8521e3ff20fa918e16d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6376 5048 bytes
font_01_sfnt_off000074ae.bin
e22f24d05c6aafee9a7194dddd7965b83af2835850013eadd72efcdc37fe9fa6
pdf-font-stream PDF embedded font (sfnt) at offset 0x74AE 11056 bytes