Malicious PDF — malware analysis report

Static analysis result for SHA-256 da674dd52aea6404…

MALICIOUS

PDF

45.2 KB Created: 2020-08-31 19:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c8506291755c6165dd9932ccc5a3323 SHA-1: 00be04ddfd99ae857dd5e74ee13fe5b58d3004cf SHA-256: da674dd52aea6404c7b19a77acfc19ec52c7ab9bbbc4b74f8ab2ec6aee69e6aa
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, disguised with a keyword related to a free Android keyboard. This suggests a phishing or scam attempt. The PDF also contains a large number of links to external PDFs, likely for SEO manipulation to improve the visibility of the malicious content. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector is a strong indicator of 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.cc/wix?keyword=clavier+azerty+android+gratuit
    • https://static.usrfiles.com/ugd/353d00_3154b6b5c11a4c36b315261abbd4d195.pdf
    • https://static.usrfiles.com/ugd/efb3f0_eeaf05c61efe4c55b8b3927fd4385cc5.pdf
    • https://static.usrfiles.com/ugd/8ab72e_e57acfd7df784a1eaceddbd39cf20742.pdf
    • https://static.usrfiles.com/ugd/19ce5d_a820bb03839544b1814369fa38e70e68.pdf
    • https://cdn.shopify.com/s/files/1/0432/6955/4329/files/compare_and_contrast_atomic_emission.pdf
    • https://cdn.shopify.com/s/files/1/0433/1274/2555/files/federation_of_american_scientists_crs_reports.pdf
    • https://static.usrfiles.com/ugd/5ed537_8dd3a3b2a9c342689aa2505ec12941e6.pdf
    • https://static.usrfiles.com/ugd/a1fb72_cef8addf91534c1996ddfa984c33505d.pdf
    • https://static.usrfiles.com/ugd/dd6616_7d1686c70adb40a89a385e56ff4990de.pdf
    • https://static.usrfiles.com/ugd/c83fdb_629bc0a1e7344977bc09150e3680daf6.pdf
    • https://static.usrfiles.com/ugd/b6edda_39415a7770334fb69c41306bf70db8cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_45aaa70368c748eabbcd910d550aa9b3.pdf
    • https://static.usrfiles.com/ugd/067ecb_371c63bf76a6418c97ece4951a0877cf.pdf
    • https://static.usrfiles.com/ugd/b11f6d_54e1c128f18649bf99491b59679a190c.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_off00007473.bin
b2ae760c07ce546e10c248882da1cba6b32ae889ac7df80622cd27bbc00485e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7473 4932 bytes
font_01_sfnt_off0000855d.bin
42627a358424e1adcbdd01d16346737e6e9a313494aa5da27dc9f9a5b33b614b
pdf-font-stream PDF embedded font (sfnt) at offset 0x855D 10192 bytes