Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d4ecf0381ccc3f…

MALICIOUS

PDF

45.3 KB Created: 2020-08-10 08:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d69d0e89ed757f34b1ca90a65e241455 SHA-1: 99df052e40738b81309c50b6c1e7a1c09e869ddd SHA-256: f5d4ecf0381ccc3f5bab70cb1009cd1d5d3b04350abe3f2f793907c91f290710
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text related to 'autocad to pdf converter free download with crack' and includes the malicious URL. This suggests a lure to download potentially unwanted or malicious software. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=autocad+to+pdf+converter+free+download+with+crack
    • http://files.sweetcandydistro.com/uploads/1/3/0/7/130738785/dadibuga.pdf
    • http://files.legacyofcolumbo.com/uploads/1/3/2/6/132681773/rigelib.pdf
    • http://files.epicrobotics.co.uk/uploads/1/3/1/4/131437919/fubikufukazalum_supesadibapi_dopofuzu.pdf
    • http://files.tedxkitchenered.com/uploads/1/3/1/4/131438069/4335446.pdf
    • https://cdn.shopify.com/s/files/1/0432/0336/2973/files/95053299034.pdf
    • https://cdn.shopify.com/s/files/1/0440/9566/8376/files/calibre_lvs_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/3929/3593/files/advantages_of_workforce_diversity.pdf
    • https://cdn.shopify.com/s/files/1/0429/1251/4201/files/57051460665.pdf
    • https://cdn.shopify.com/s/files/1/0430/9535/9641/files/46917288445.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8573/files/didagijukinax.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46905239833.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6278/files/53140292359.pdf
    • https://cdn.shopify.com/s/files/1/0434/0695/0550/files/gnralits_sur_les_automates_programmables_industriels.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50537202024.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sebifoxof.pdf
    • https://cdn.shopify.com/s/files/1/0433/9302/4151/files/63778814389.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/difficult_english_words_with_meaning.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_off00007371.bin
e66c586b210bbe8cc174aed790cf39341509d215f79b2f6d647568624f11ac68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7371 5268 bytes
font_01_sfnt_off00008573.bin
3f41ec8e2ae954ca812e22624fe65b1dbc1cd8fd20c24c69be1f3dba0bd3c8dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8573 10256 bytes

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