Malicious PDF — malware analysis report

Static analysis result for SHA-256 57da0751329749be…

MALICIOUS

PDF

42.9 KB Created: 2020-08-31 01:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e074575f2283cf8a735fa0797552f67 SHA-1: d0f9744d3ee0869d44c049cdd56f0955446abbc1 SHA-256: 57da0751329749be531bf088449ff87390314891a5ac79abdec4fac3e241ac41
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains the same redirector URL and a large number of other URLs, many pointing to shopify.com, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to click on malicious links within the document.

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.ru/wix?keyword=yolver+da%25C4%259Flar+yolver+bana
    • https://cdn.shopify.com/s/files/1/0429/9482/7418/files/59355649306.pdf
    • https://cdn.shopify.com/s/files/1/0465/3626/1782/files/ravikazolusufizab.pdf
    • https://cdn.shopify.com/s/files/1/0431/5847/0813/files/98591449817.pdf
    • https://cdn.shopify.com/s/files/1/0437/3292/6615/files/tratamiento_de_cancer_tiroideo.pdf
    • https://cdn.shopify.com/s/files/1/0439/7685/1614/files/al_quran_word_by_word_translation.pdf
    • https://cdn.shopify.com/s/files/1/0437/3040/3477/files/volume_of_cube_worksheet_grade_7.pdf
    • https://cdn.shopify.com/s/files/1/0428/8790/5446/files/13372442776.pdf
    • https://cdn.shopify.com/s/files/1/0432/4540/4327/files/economie_francaise.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/telecharger_les_journaux_algeriens_d_aujourd_hui_en_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/bigibimogaweseviwuwip.pdf
    • https://cdn.shopify.com/s/files/1/0432/6490/1284/files/nolunuzisuxined.pdf
    • https://cdn.shopify.com/s/files/1/0430/0662/3903/files/neufert_architect_s_data_english.pdf
    • https://static.usrfiles.com/ugd/37321e_2001bda13423425385f2cc2ec7c46a31.pdf
    • https://static.usrfiles.com/ugd/b8c837_d480769a35384017974c1bb12043c8d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_ebaebab9db8e494c85fdf9b5bd3c9800.pdf
    • https://static.usrfiles.com/ugd/b8c837_758c2b7f06cc41bfa13a33e69335c60d.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_off000050b4.bin
1729ab05514b52c3439a1cd737edd41a98b5bf3607d66ae785e9b5e84ba05946		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50B4 4796 bytes
font_01_sfnt_off0000610e.bin
bab329c086194edd039a6d6e70908648cb3e00088f4a22cc3dd3c86f84146ec0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x610E 15684 bytes
font_02_sfnt_off00008eea.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EEA 4324 bytes

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