Malicious PDF — malware analysis report

Static analysis result for SHA-256 49713c7c88d89160…

MALICIOUS

PDF

44.8 KB Created: 2020-08-30 10:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e373819f071ef911bea7b1ffa801bac1 SHA-1: 368b90757ce1f293cddc7f78324acc51ea72da8a SHA-256: 49713c7c88d89160d4569d9efe75a96a0e568afd0c9d64d98beb0cb90bee5985
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, suggesting an attempt at SEO poisoning or link farming. One critical heuristic identified a link to a known malicious redirector at 'ttraff.com'. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same URL, reinforcing the malicious intent to redirect users.

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/wix?keyword=solar+system+reading+comprehension+worksheets+free
    • https://cdn.shopify.com/s/files/1/0430/4257/0401/files/64763595446.pdf
    • https://cdn.shopify.com/s/files/1/0440/5601/9109/files/26626159636.pdf
    • https://cdn.shopify.com/s/files/1/0429/5891/3689/files/wigutuvipite.pdf
    • https://cdn.shopify.com/s/files/1/0430/8746/2551/files/30443709919.pdf
    • https://cdn.shopify.com/s/files/1/0438/6439/1845/files/kunijejavonebenezunita.pdf
    • https://static.usrfiles.com/ugd/ac72e0_17756dcb25034fd88e4e0ed026fd0fdc.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d4ba40b1a6b4112bf25479cba565d0e.pdf
    • https://static.usrfiles.com/ugd/de3d83_d7e8a4b4b3ed4f21bc50f1e9287b59cf.pdf
    • https://static.usrfiles.com/ugd/7041e4_fc54778b68b24cc1be484de95eb5001c.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd78d30831c44b54afee094af1d5ca48.pdf
    • https://cdn.shopify.com/s/files/1/0433/0559/9140/files/75789766928.pdf
    • https://cdn.shopify.com/s/files/1/0430/1350/5185/files/crpc_bare_act_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0460/3143/7983/files/bestie_camera_apk_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/vunosagovube.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_off00006161.bin
0867937049aa7aef19edb8ead0be00a04e1efe40c844c3657af40717d485d606
pdf-font-stream PDF embedded font (sfnt) at offset 0x6161 5720 bytes
font_01_sfnt_off000074bc.bin
2a558c8a1eb251529ea313c3ac421e9b2263ce5a9efadc4766b19c3fb99c8c3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x74BC 10308 bytes
font_02_sfnt_off000097fd.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x97FD 4324 bytes