Malicious PDF — malware analysis report

Static analysis result for SHA-256 757d51c3ba97c537…

MALICIOUS

PDF

44.9 KB Created: 2020-08-18 16:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9a09e75e1bd60e40a2ac5fb7a5804d6 SHA-1: fddef8d271c29ae586fd72c541f12344966f7c18 SHA-256: 757d51c3ba97c5375e38c08cc2992580b3f96ad7282faf244cfeb3eff8d6e505
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one pointing to a known malicious redirector. The document body and embedded links suggest a lure related to educational content, likely to drive traffic to malicious sites. The ML classifier strongly indicated maliciousness, and the presence of a link farm further supports a malicious intent to distribute malware or phishing 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.com/pify?keyword=desmos+introduction+to+geometry+proofs+answers
    • http://gubuzaza.engagechurchaurora.com/uploads/1/3/0/8/130874359/0c1e8588f34ad2.pdf
    • http://sakojo.spanishduluth.com/uploads/1/3/1/4/131406086/8992109.pdf
    • http://files.royalmarketingconcepts.com/uploads/1/3/1/3/131380741/997332.pdf
    • http://files.chris-palmieri.com/uploads/1/3/0/8/130813582/pojafuseperojoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/8747/0499/files/5176071901.pdf
    • https://cdn.shopify.com/s/files/1/0437/7142/9015/files/ceremonial_magic_israel_regardie.pdf
    • https://cdn.shopify.com/s/files/1/0435/7950/6847/files/31640657590.pdf
    • https://cdn.shopify.com/s/files/1/0431/7046/3912/files/marowuzumer.pdf
    • https://cdn.shopify.com/s/files/1/0430/2045/1997/files/zisunawafi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9954/6009/files/65468572183.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3097/files/ssc_stenographer_exam_paper.pdf
    • https://cdn.shopify.com/s/files/1/0432/3413/2131/files/52979539796.pdf
    • https://cdn.shopify.com/s/files/1/0448/1895/6448/files/atypical_facial_pain_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0438/3893/1109/files/pojipele.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062ba.bin
84dfeb5166e2b1db1e1c4cac90be2ac194fa1715ff19ddf2be381a90ed4d12ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x62BA 5520 bytes
font_01_sfnt_off00007581.bin
2805450c74ca35432c477b99be68cf145276f24a0b69dd1675cc831ab1d3bd03
pdf-font-stream PDF embedded font (sfnt) at offset 0x7581 10236 bytes
font_02_sfnt_off00009860.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x9860 4324 bytes