Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6acda97ca5ab8e…

MALICIOUS

PDF

39.6 KB Created: 2020-08-19 23:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e8d18a2425303c4e17421759becce40 SHA-1: 4bb57078df739bdfd90923d34c7e623286c583b0 SHA-256: 6a6acda97ca5ab8e619cefb42ad0f9c5c31f5a62bfe12a3c388852e967b11acd
154 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with one pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, includes the URL 'https://ttraff.com/pify?keyword=similes+worksheet+2nd+grade', suggesting a lure to a malicious site. The presence of numerous external PDF links also indicates a link farm or redirection attempt.

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.com/pify?keyword=similes+worksheet+2nd+grade
    • http://files.gdl-art.com/uploads/1/3/0/7/130775249/c1bd825371a3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3333/7768/files/54194998675.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/mopesugajotixolibux.pdf
    • https://cdn.shopify.com/s/files/1/0433/5019/6392/files/varicela_en_los_nios.pdf
    • https://cdn.shopify.com/s/files/1/0434/5652/8544/files/kawavepele.pdf
    • https://cdn.shopify.com/s/files/1/0432/2204/0731/files/6122723394.pdf
    • https://cdn.shopify.com/s/files/1/0432/1044/0862/files/anna_karenina_magyarul.pdf
    • https://cdn.shopify.com/s/files/1/0440/3966/7877/files/15055382471.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/basic_circuit_components.pdf
    • https://cdn.shopify.com/s/files/1/0434/5017/1554/files/how_was_caprock_escarpment_formed.pdf
    • https://cdn.shopify.com/s/files/1/0438/5302/1334/files/acuerdo_de_ginebra_1966.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_off00005c28.bin
98def6766bd85b13accaa0f03ca106f99bc29ade8c037e423f8c73a3d2070974
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C28 5628 bytes
font_01_sfnt_off00006f2b.bin
b687b9d00275fd84b7ba7176cb9b58e7d9cffdae86f5c13e1ea27a633fddf96b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F2B 10080 bytes