Malicious PDF — malware analysis report

Static analysis result for SHA-256 498793adec55ae9d…

MALICIOUS

PDF

46.0 KB Created: 2020-08-03 15:39:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: caa82856ddf0057e8a70904017c652c7 SHA-1: 7db89fcd6757776e6a085c9804848853220c1951 SHA-256: 498793adec55ae9d9f53c2316b94ae50b3d0e90da4892884264a0316967de536
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to lure users to a malicious redirector. The primary malicious URL identified is https://ttraff.com/pify?keyword=bitwise+operator+in+c+pdf. This URL is likely used to redirect the user to a phishing or malware distribution site. The ML classifier strongly supports the malicious nature of this PDF.

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=bitwise+operator+in+c+pdf
    • http://files.conveycoach.com/uploads/1/3/1/3/131398117/3945fb.pdf
    • http://files.hd-crafts.com/uploads/1/3/1/1/131163914/gukusewavafa_zamopelumafimek.pdf
    • http://files.dennismccalmont.com/uploads/1/3/0/9/130969577/8f174463.pdf
    • http://files.trinalang.com/uploads/1/3/1/4/131454345/b1fd33adb90ff52.pdf
    • https://cdn.shopify.com/s/files/1/0428/1712/6567/files/12311678683.pdf
    • https://cdn.shopify.com/s/files/1/0431/4952/5149/files/sixufanusofuvagiw.pdf
    • https://cdn.shopify.com/s/files/1/0428/8118/8003/files/renekixemubopujiragajevu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0536/9758/files/gatodulalejad.pdf
    • https://cdn.shopify.com/s/files/1/0438/9899/4856/files/63349835138.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34007792176.pdf
    • https://cdn.shopify.com/s/files/1/0435/2291/6520/files/fizodakokigin.pdf
    • https://cdn.shopify.com/s/files/1/0431/9107/4976/files/muwisenuxafegavuxurewaro.pdf
    • https://cdn.shopify.com/s/files/1/0432/2725/0848/files/59148919789.pdf
    • https://cdn.shopify.com/s/files/1/0431/0047/1456/files/7384926039.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65039204935.pdf
    • https://cdn.shopify.com/s/files/1/0427/6381/3020/files/nowigifosifovesurolibipip.pdf
    • https://cdn.shopify.com/s/files/1/0435/8812/4830/files/likow.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_off000069da.bin
d64f58f66a52db0c9b351a58c57d26c9206b3ca295bff1c66416e00cf91c8773
pdf-font-stream PDF embedded font (sfnt) at offset 0x69DA 5260 bytes
font_01_sfnt_off00007bdd.bin
c64a1e6edb907501517366459021c1e14efe032df2d1590b5fc5c1737c6f6b51
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BDD 14936 bytes