Malicious PDF — malware analysis report

Static analysis result for SHA-256 4406386d62b56db0…

MALICIOUS

PDF

44.5 KB Created: 2020-08-21 10:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18c4baf625d2334269f82dcdcf040936 SHA-1: e8483088d83fbc3e8310ab01ea9ecd88cd03b418 SHA-256: 4406386d62b56db009bc2dac76b9228ca0a90468250989781fbc7466d521d1d5
152 Risk Score

Malware Insights

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

The PDF contains a prominent link disguised as 'Best entry level resume templates' that redirects to a malicious URL. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms this, and the ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting the primary intent is to redirect the user to a potentially harmful site.

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=best+entry+level+resume+templates
    • http://najakumet.melissaraehairstylist.com/uploads/1/3/0/7/130776791/buxudo.pdf
    • http://files.cardiffbachoir.org.uk/uploads/1/3/1/3/131378968/pekir_miwuzabadex.pdf
    • https://cdn.shopify.com/s/files/1/0432/4756/7003/files/aditi_singhal.pdf
    • https://cdn.shopify.com/s/files/1/0433/0812/2280/files/16846356203.pdf
    • https://cdn.shopify.com/s/files/1/0437/2476/7400/files/jufonorupozakevam.pdf
    • https://cdn.shopify.com/s/files/1/0431/1977/1799/files/vakaxitof.pdf
    • https://cdn.shopify.com/s/files/1/0429/2712/8735/files/micro_sd_card_cannot_format_write_protected.pdf
    • https://cdn.shopify.com/s/files/1/0430/5226/9717/files/sadetaxako.pdf
    • https://cdn.shopify.com/s/files/1/0428/0595/2671/files/zalamaruwut.pdf
    • https://cdn.shopify.com/s/files/1/0431/2917/6232/files/tien_len_online.pdf
    • https://cdn.shopify.com/s/files/1/0429/1775/7095/files/biodiversity_loss_and_its_impact_on_humanity.pdf
    • https://cdn.shopify.com/s/files/1/0435/7426/3963/files/89131490366.pdf
    • https://cdn.shopify.com/s/files/1/0431/1960/7962/files/jirezuge.pdf
    • https://cdn.shopify.com/s/files/1/0432/8679/0304/files/gepin.pdf
    • https://cdn.shopify.com/s/files/1/0428/9468/8412/files/nimulizewage.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_off00006f6c.bin
f29b075fe35463e6ded258b068a81e5fb26310d4a3e0737ea3363f70c7b6ccd9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6C 5176 bytes
font_01_sfnt_off000080f9.bin
c4f2d1141a7c8491a174d9d41f8c30e3aab9944272423ffbb8172da54b885b22
pdf-font-stream PDF embedded font (sfnt) at offset 0x80F9 10616 bytes