Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4a7a1b22f22f63…

MALICIOUS

PDF

45.4 KB Created: 2020-08-19 00:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd8db7ca3132e38d62de2c44193c1bb2 SHA-1: a13026f8f904a83ad2da602a68dc9cfa9fa89642 SHA-256: cd4a7a1b22f22f6334833d2f140544c892ab4e9d81f45fa3f5a7ed07ed311915
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=abstract+wallpaper+4k+free', suggesting a lure to a malicious site. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports the malicious intent.

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=abstract+wallpaper+4k+free
    • http://toniz.dawnofnight.com/uploads/1/3/1/4/131408024/galutik_luwepojape_ripurov_gotodinagetu.pdf
    • http://xotuz.boylegroupny.com/uploads/1/3/0/7/130775320/punumejiruxilavozem.pdf
    • http://files.davissound.net/uploads/1/3/2/8/132816066/104354.pdf
    • https://cdn.shopify.com/s/files/1/0435/0155/1771/files/wozenatarafatawera.pdf
    • https://cdn.shopify.com/s/files/1/0432/8180/9558/files/abide_with_me_matt_maher.pdf
    • https://cdn.shopify.com/s/files/1/0431/0145/4500/files/cutting_edge_pre_intermediate_workbook_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rerotapok.pdf
    • https://cdn.shopify.com/s/files/1/0431/5791/3749/files/pilifutalikinofimaroj.pdf
    • https://cdn.shopify.com/s/files/1/0439/2235/8427/files/93834893536.pdf
    • https://cdn.shopify.com/s/files/1/0428/6667/1782/files/75434871422.pdf
    • https://cdn.shopify.com/s/files/1/0435/7318/2625/files/488979600.pdf
    • https://cdn.shopify.com/s/files/1/0435/1796/8543/files/bikig.pdf
    • https://cdn.shopify.com/s/files/1/0430/5348/2135/files/anaconda_movie_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0448/1505/7056/files/breves_de_comptoir_gratuit.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005263.bin
c45f0e1a93f0be75b7d5a516b5e88a181d9cde6ff235e9cc6cb73af8e18ce864		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5263 4908 bytes
font_01_sfnt_off0000632b.bin
f39df72308ec3f2144ae038b33ba784ca037dd017467bf07b31b4870ca0d4c28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x632B 9904 bytes
font_02_sfnt_off00008551.bin
3f70697d8cfd0b9becff5adcad726f9ffedcc5d773cc6f7abbcc82b2f8034994		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8551 16164 bytes
font_03_sfnt_off00009a4a.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A4A 4324 bytes

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