Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b18ddd91261bee5…

MALICIOUS

PDF

42.3 KB Created: 2020-08-10 00:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb494de36f35a65bd86047daab37ab19 SHA-1: c5079bd8f2ed2489b105b01b13c64db1c36d3f59 SHA-256: 7b18ddd91261bee54429f602f49f47c9703af647366c70a01853b4e23ecd9491
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.ru'. The document body, though heavily obfuscated, contains this URL, suggesting an attempt to direct users to malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL is sufficient evidence of malicious intent.

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=interacciones+medicamentosas+aines+pdf
    • http://files.mannaministries.org/uploads/1/3/0/7/130739322/rafanukekazedit.pdf
    • http://files.bellecityvet.com/uploads/1/3/2/6/132682892/4717737.pdf
    • http://files.markhegg.com/uploads/1/3/1/4/131407102/mawosadigoji-kananid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0452/3737/1037/files/sars_bursary_application_forms_2020.pdf
    • https://cdn.shopify.com/s/files/1/0435/3749/8271/files/47809531512.pdf
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/regidizetofetosum.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pujofupokutesigitugut.pdf
    • https://cdn.shopify.com/s/files/1/0440/5588/8022/files/binary_and_hexadecimal_number_system.pdf
    • https://cdn.shopify.com/s/files/1/0434/9463/7734/files/rirategototaz.pdf
    • https://cdn.shopify.com/s/files/1/0434/3224/7457/files/71292573454.pdf
    • https://cdn.shopify.com/s/files/1/0434/3640/8982/files/43596684643.pdf
    • https://cdn.shopify.com/s/files/1/0432/7184/8100/files/how_to_install_optifine_1._8.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/raduvurebipafidin.pdf
    • https://cdn.shopify.com/s/files/1/0431/6200/9760/files/ielts_academic_reading_samples_with_answers.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_off0000647f.bin
75593df660694e7997d070ac0cacf84bbd81e49107c1734563cc52bd8df049c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x647F 5208 bytes
font_01_sfnt_off0000761d.bin
45b3a4be14757dff15c27411d46bef4239fc761ef97471155ffb3e9e02ad9802
pdf-font-stream PDF embedded font (sfnt) at offset 0x761D 11140 bytes