Malicious PDF — malware analysis report

Static analysis result for SHA-256 100aa26996c939e3…

MALICIOUS

PDF

43.9 KB Created: 2020-09-06 19:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3fdc350642a2759757d7c4ba3f39b0b3 SHA-1: c1a57a8251397475b1be4267ec35c158bdc37608 SHA-256: 100aa26996c939e3ff54a3f97dc4cd0d3ab2d08526756df51c07d04be47fda06
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which is a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for 'family values' and includes the malicious URL. The presence of numerous external PDF links, many pointing to benign Shopify URLs, suggests a link farm or SEO poisoning tactic to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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.link/wix?keyword=valores+familiares+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0465/5310/4542/files/tevisebogoletenizu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9731/7783/files/51301167162.pdf
    • https://cdn.shopify.com/s/files/1/0437/4387/1127/files/netgear_c3000_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/6598/9528/files/file_ui_l_g.pdf
    • https://cdn.shopify.com/s/files/1/0440/3075/4966/files/conflict_minerals_reporting_2019.pdf
    • https://cdn.shopify.com/s/files/1/0432/4166/8775/files/31014664013.pdf
    • https://cdn.shopify.com/s/files/1/0430/3169/1421/files/jafuz.pdf
    • https://cdn.shopify.com/s/files/1/0429/9328/7331/files/sirajupusixalome.pdf
    • https://cdn.shopify.com/s/files/1/0433/3253/4422/files/train_time_table_2018.pdf
    • https://cdn.shopify.com/s/files/1/0431/2940/5600/files/richard_burton_arabian_nights_16_volumes.pdf
    • https://cdn.shopify.com/s/files/1/0443/6302/2492/files/65392692317.pdf
    • https://static.usrfiles.com/ugd/5bb01c_f0a294a33b6d4a3ea73d4130a83f1a9e.pdf
    • https://static.usrfiles.com/ugd/bcfc12_c2388eaa0409447bbf131c719b3e9e1d.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ce3.bin
f53446376c7788486a1342d9d7443dd00448904531383994a0c7609711129d90
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE3 5152 bytes
font_01_sfnt_off00007e57.bin
a5ea69f1227a310ee90c365d02871ffaa1b5f0d3615f8b77dda1b646af258c50
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E57 11060 bytes