Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c4577a7a0b711bf…

MALICIOUS

PDF

47.2 KB Created: 2020-08-11 04:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d28d76d2f29918d56a14d2bcace1cb90 SHA-1: 654874c7183d520b8cdb6b95ab0387662cafa632 SHA-256: 2c4577a7a0b711bfc5c16d8cdc1d217ba0de65baa46e7f8677e7b6129de2e832
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary one leading to a known malicious redirector. The document body, though heavily obfuscated, appears to contain the title 'Nrc assam draft list 2020 pdf', suggesting a lure for users searching for this information. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms the malicious nature of the redirector, and 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, likely for SEO manipulation or to host further malicious content. No scripts were extracted, but the primary attack vector is the redirection to a malicious URL.

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=nrc+assam+draft+list+2020+pdf
    • http://tupuxa.stjvschool.org/uploads/1/3/0/7/130776418/6e61536473c0ad2.pdf
    • http://files.boilingfrogproductions.com/uploads/1/3/0/8/130813732/zesanivegokemut-givod-bobuwovabifa.pdf
    • http://wetov.mtslma.com/uploads/1/3/2/7/132740214/nukupizelaraz.pdf
    • https://cdn.shopify.com/s/files/1/0430/4555/2290/files/kokenunowizenager.pdf
    • https://cdn.shopify.com/s/files/1/0439/1596/8680/files/body_parts_in_japanese.pdf
    • https://cdn.shopify.com/s/files/1/0435/4156/1503/files/45564840199.pdf
    • https://cdn.shopify.com/s/files/1/0432/4586/3067/files/besoin_en_fond_de_roulement_calcul.pdf
    • https://cdn.shopify.com/s/files/1/0428/3046/3142/files/88971005399.pdf
    • https://cdn.shopify.com/s/files/1/0428/1643/8438/files/kuroborowogixujo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9703/0805/files/sizavovivukub.pdf
    • https://cdn.shopify.com/s/files/1/0437/9593/9488/files/north_america_political_outline_map.pdf
    • https://cdn.shopify.com/s/files/1/0435/7311/7091/files/genixujizuwujoliziril.pdf
    • https://cdn.shopify.com/s/files/1/0427/8163/8812/files/99729536227.pdf
    • https://cdn.shopify.com/s/files/1/0445/3584/0932/files/how_do_you_change_your_minecraft_name.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069dd.bin
3402d688e413802d26d49aa82b6b1a642729f2ffa44385afef0ab310762b7485		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69DD 5544 bytes
font_01_sfnt_off00007c92.bin
2b0b2ba6e24c5a4d44c1dd9b3ea6005ae8c665ed4583b9a8ebd2b076e1baceab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C92 4592 bytes
font_02_sfnt_off00008b6b.bin
fd05c71d01a76466f23fbb345574246e075435502776990c7e81303e63c92798		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B6B 10488 bytes

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