Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfbd6629cea8cdd3…

MALICIOUS

PDF

42.0 KB Created: 2020-08-11 10:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 090687453c7586dbd1cdbe16b82c08af SHA-1: dff49e00eafddb4e80b71b7da37014993670a369 SHA-256: cfbd6629cea8cdd3973cc48a1b965774daf478f6a42f1f83499e9aacc0a66549
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary malicious redirector URL identified as https://ttraff.com/pify?keyword=after+school+program+business+plan+pdf. The document body, though partially corrupted, also contains this URL and other Shopify links, suggesting a lure to disguise malicious content. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is part of a distribution campaign.

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=after+school+program+business+plan+pdf
    • http://files.midwifemaddy.com/uploads/1/3/2/3/132302759/xonikitelijubu.pdf
    • http://files.livingwordinkentucky.com/uploads/1/3/0/9/130969938/76c3d4cf0551.pdf
    • http://files.northparkcentralhomedecor.com/uploads/1/3/0/7/130775982/bibavofepujizami.pdf
    • http://files.davidgillaspie.com/uploads/1/3/0/8/130813461/biwimadikekakiw_gemalabodezug_dajemezezut.pdf
    • https://cdn.shopify.com/s/files/1/0432/9078/8000/files/14120516066.pdf
    • https://cdn.shopify.com/s/files/1/0429/9754/7157/files/baldur_s_gate_apk.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/calikusu_book_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/3452487344.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/nasukororipal.pdf
    • https://cdn.shopify.com/s/files/1/0430/6763/7917/files/26933052589.pdf
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/48268713949.pdf
    • https://cdn.shopify.com/s/files/1/0429/5576/7967/files/852281496.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9128/files/raxidujarepu.pdf
    • https://cdn.shopify.com/s/files/1/0452/5824/4257/files/sulijamodurowisakez.pdf
    • https://cdn.shopify.com/s/files/1/0435/5820/7651/files/multivariate_data_analysis_hair_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/laxigitifudavizemitipa.pdf
    • https://cdn.shopify.com/s/files/1/0450/0425/9492/files/wodijenovitaputukinur.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_off000065df.bin
19a196ce635b763904efef0667b45af38c72359279833c5e09a3049ef939f07b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65DF 5700 bytes
font_01_sfnt_off00007914.bin
428d9407f3f113738149bcb932366a076e51e8e83b1df78c0f5e932626966d07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7914 9960 bytes

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