Malicious PDF — malware analysis report

Static analysis result for SHA-256 772b82279667beb8…

MALICIOUS

PDF

47.3 KB Created: 2020-07-26 11:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf1e248788d56f069649979abd3a0ca7 SHA-1: 75f45752b28fa5d04eac13328b22f25983370a9a SHA-256: 772b82279667beb81c6de53c6c4f94e739b8dae09bce0f720fe8aa57b46f9aff
162 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link and a large number of external PDF links, suggesting a link farm or redirection scheme. The presence of a 'download button' lure further supports a malicious intent to redirect users. While no scripts were extracted, the PDF structure and embedded links strongly indicate a phishing or redirection attack, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=arabesque+2+debussy+sheet+music
    • http://files.ailightup.com/uploads/1/3/2/8/132814123/4850100.pdf
    • http://files.pghdawgs.com/uploads/1/3/2/6/132695212/9502732.pdf
    • http://files.eastafricanscholarsfund.org/uploads/1/3/0/8/130874284/rirate.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1541/2632/files/64467419914.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dutevitijenunolekegek.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kefemomorevogik.pdf
    • https://cdn.shopify.com/s/files/1/0434/8005/5958/files/nalugeturup.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/babape.pdf
    • https://cdn.shopify.com/s/files/1/0431/7573/9560/files/52569299959.pdf
    • https://cdn.shopify.com/s/files/1/0437/8502/7745/files/7760983494.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/93503633511.pdf
    • https://cdn.shopify.com/s/files/1/0428/9508/1635/files/towejadagoxalebamapiwoko.pdf
    • https://cdn.shopify.com/s/files/1/0428/5654/6467/files/6477166024.pdf
    • https://cdn.shopify.com/s/files/1/0430/7678/0181/files/88310300616.pdf
    • https://cdn.shopify.com/s/files/1/0437/4469/0337/files/sivolixatebagurivimavenow.pdf
    • https://cdn.shopify.com/s/files/1/0434/9100/0472/files/lotaxupazedipejixeniv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xekugoxozeritazol.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jonexosorovofevovu.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_off00006a19.bin
7d05087c6e7710611461a47d71c5572687013c753c941f8eb3d41d7c07d80ac5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A19 5304 bytes
font_01_sfnt_off00007c1f.bin
0b3e642662e1321b2e59f0027addbbd0129a34a0167db7542049233752822898		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C1F 16092 bytes

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