Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2c1b09ca90197a2…

MALICIOUS

PDF

41.3 KB Created: 2020-08-11 05:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e27afe9cfcd7a104162575b9d75a4d88 SHA-1: 8828e1b1a871644f9421d4c52a9cb5ca09176975 SHA-256: d2c1b09ca90197a2f7ef2a93aa516b65a2c064a9637ec6fc956c7dbfe6a46141
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one heuristic specifically identifying it as a 'PDF SEO Link Farm'. The primary malicious link, 'https://ttraff.com/pify?keyword=capelania+escolar+desafios+e+oportunidades+pdf', suggests a redirection to potentially harmful content. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated and contains embedded URLs, further supporting 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=capelania+escolar+desafios+e+oportunidades+pdf
    • http://files.blythetierneydever.com/uploads/1/3/1/4/131483266/e27eb.pdf
    • http://files.empowerugandanow.com/uploads/1/3/1/3/131381904/6a115ddec433.pdf
    • http://files.fcpsartsacademy.org/uploads/1/3/0/8/130815009/6fbecafced9477.pdf
    • http://files.775marketing.com/uploads/1/3/0/7/130739916/0a3a53f59d1.pdf
    • http://rozug.joburgkidspaces.com/uploads/1/3/0/7/130738629/6fc2fe0.pdf
    • https://cdn.shopify.com/s/files/1/0432/7351/9269/files/matufalidalokilezelozanev.pdf
    • https://cdn.shopify.com/s/files/1/0438/4551/7469/files/symbolic_interactionism.pdf
    • https://cdn.shopify.com/s/files/1/0430/0357/6481/files/power_king_tractor_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/7068/4317/files/16473057744.pdf
    • https://cdn.shopify.com/s/files/1/0432/3796/5979/files/vupibanepumimujanu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9755/5108/files/how_to_make_a_role_in_discord.pdf
    • https://cdn.shopify.com/s/files/1/0434/6046/0701/files/virtual_drum_set.pdf
    • https://cdn.shopify.com/s/files/1/0431/1462/7234/files/zapeketipofozizomi.pdf
    • https://cdn.shopify.com/s/files/1/0430/2218/8701/files/28744106086.pdf
    • https://cdn.shopify.com/s/files/1/0436/9963/4328/files/36093988877.pdf
    • https://cdn.shopify.com/s/files/1/0432/7342/0965/files/gezasapiralebesimegugujez.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_off00006029.bin
9ec749dc54862e82ff835ad0ed13fe41892f212b711d20bce3e4f0e1a5bde498		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6029 5052 bytes
font_01_sfnt_off00007162.bin
06f7e0fc2f414ee68d8aa03c3477fec01a992d65a4db8e4d71643ec961b32514		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7162 12152 bytes

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