Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa7c2dadc79a5d72…

MALICIOUS

PDF

35.7 KB Created: 2020-08-31 05:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cc2f0f74926430178e4d828b7eac95b SHA-1: a33c59b9f24139a516ef1336c25da8265727f3a3 SHA-256: aa7c2dadc79a5d723d555a6ff2840362ae6941cf7002a5d77d47446b5137143f
152 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to a critical heuristic firing for a PDF redirector link pointing to known malicious infrastructure. Additionally, a PDF link farm heuristic indicates the document's purpose is to host numerous external links. The primary malicious IOC is the redirector URL, which is likely used to lure victims into a phishing or malware download site. The document body contains garbled text and embedded URLs, further supporting the link farm and redirection attack pattern.

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/wix?keyword=dymatize+shaker+%25C5%259Fi%25C5%259Fe
    • https://static.usrfiles.com/ugd/fd30ac_753fd202b1784baa9c7db550d4dcd47f.pdf
    • https://static.usrfiles.com/ugd/3aca14_41be697d114b4fb393f5b06e99a831e4.pdf
    • https://static.usrfiles.com/ugd/aff7ca_1d051e8ab7d64273890d94374b49b153.pdf
    • https://cdn.shopify.com/s/files/1/0454/4541/5070/files/brihaspativar_vrat_katha_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/9249/9877/files/amelie_walzer_piano_noten.pdf
    • https://cdn.shopify.com/s/files/1/0435/0243/6512/files/pivamabafuret.pdf
    • https://cdn.shopify.com/s/files/1/0435/1787/0239/files/6094274495.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/lavatodopolurenofa.pdf
    • https://cdn.shopify.com/s/files/1/0430/1609/3849/files/29002943926.pdf
    • https://cdn.shopify.com/s/files/1/0450/4292/5726/files/ace_academy_2020_test_series.pdf
    • https://cdn.shopify.com/s/files/1/0431/9461/3924/files/kufowoxifuwesiful.pdf
    • https://cdn.shopify.com/s/files/1/0433/9518/6844/files/85973075996.pdf
    • https://cdn.shopify.com/s/files/1/0440/4396/0485/files/hypothesis_test_excel_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/8012/2532/files/aspca_pet_insurance_information.pdf
    • https://cdn.shopify.com/s/files/1/0435/8704/3496/files/10th_english_book_2020.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_off00004cae.bin
bd8f693f1810de4151c9a4db99f9d762e4c5947d27839e288c20a9c6c950692d
pdf-font-stream PDF embedded font (sfnt) at offset 0x4CAE 5356 bytes
font_01_sfnt_off00005e51.bin
18433f3e7ffb7f6369d9d7454f582126fe8e1f991a0917301f7f3e2dec86a872
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E51 10684 bytes