Malicious PDF — malware analysis report

Static analysis result for SHA-256 a707afb07347da52…

MALICIOUS

PDF

55.5 KB Created: 2020-07-30 12:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2737499687f661dcd41d22b2e9735046 SHA-1: f336262065ba2b34ded94780d38275ddf9d58f4d SHA-256: a707afb07347da52aafc8445dcad88e9a587850364a5dc311ae1f5791c91ebcf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The embedded links, particularly the one to 'ttraff.ru', suggest an attempt to redirect users to potentially harmful content. The document body itself is heavily obfuscated and appears to be largely unreadable text, further supporting a malicious intent rather than legitimate content.

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/pify?keyword=expos%25C3%25A9+sur+le+bilinguisme+pdf
    • http://files.relationalintegration.org/uploads/1/3/1/4/131438248/7b3ecd.pdf
    • http://files.memorybengesa.org/uploads/1/3/1/0/131070561/0002bbc3f3f8.pdf
    • http://files.pilgrimlutheranfreedom.com/uploads/1/3/1/6/131637014/3448616.pdf
    • http://files.kupetspinkinvitational.com/uploads/1/3/2/8/132815119/8444318.pdf
    • http://files.thekissinglipsofamerica.com/uploads/1/3/1/4/131437889/kalamapiloniweb.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tugomedimugatusigoxafif.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27392185694.pdf
    • https://cdn.shopify.com/s/files/1/0435/0207/6070/files/52747160914.pdf
    • https://cdn.shopify.com/s/files/1/0437/6176/2456/files/bigivalowovevuxejazenasim.pdf
    • https://cdn.shopify.com/s/files/1/0435/8782/9928/files/degazinopifox.pdf
    • https://cdn.shopify.com/s/files/1/0432/7319/1587/files/reguzeli.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7870/files/vufija.pdf
    • https://cdn.shopify.com/s/files/1/0430/4994/3202/files/kapewawere.pdf
    • https://cdn.shopify.com/s/files/1/0433/3089/6026/files/77648669896.pdf
    • https://cdn.shopify.com/s/files/1/0437/9040/1687/files/watijodaduzo.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_off00009697.bin
f41ce6ed85ea8fdecc18673d31b0ef4cde877e2346344338fa7b06a50166e906
pdf-font-stream PDF embedded font (sfnt) at offset 0x9697 5260 bytes
font_01_sfnt_off0000a814.bin
8c70db7bd03f80580dd6614de711060b4f8b38863aec0d03cb4a7668709bd919
pdf-font-stream PDF embedded font (sfnt) at offset 0xA814 12400 bytes