Malicious PDF — malware analysis report

Static analysis result for SHA-256 25be174c21eddff4…

MALICIOUS

PDF

36.1 KB Created: 2020-08-20 10:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c518c9baa0d5ed69b67a68ba4ab2a07 SHA-1: 39ff81ef14d6636b225a4a63ce8b1c516ca6bd01 SHA-256: 25be174c21eddff496d41c160fcea2e9d9a245c3a1fa448aa25d59a992795e9a
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL and numerous other links hosted on 'cdn.shopify.com' and other domains, suggesting a link farm or redirection strategy. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves tricking the user into clicking a malicious URL, likely for further exploitation or credential harvesting.

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=killer+is+dead+scarlett+challenge+guide
    • http://gunesis.kristinedizon.com/uploads/1/3/1/4/131437402/7746946.pdf
    • http://files.upsilonmudeltas.com/uploads/1/3/0/8/130814596/zodasakogaf.pdf
    • http://tapufapid.docstover.org/uploads/1/3/2/6/132695213/gufijel_dubodaridi_fakalut_bamisivefubobuv.pdf
    • https://cdn.shopify.com/s/files/1/0437/0667/9447/files/36922169389.pdf
    • https://cdn.shopify.com/s/files/1/0431/5004/9448/files/jepodigobesobujepedina.pdf
    • https://cdn.shopify.com/s/files/1/0427/8992/9116/files/begak.pdf
    • https://cdn.shopify.com/s/files/1/0431/1092/4437/files/multithreading_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0430/7081/6407/files/82253717324.pdf
    • https://cdn.shopify.com/s/files/1/0431/6083/0116/files/94994672169.pdf
    • https://cdn.shopify.com/s/files/1/0433/0212/5733/files/32149271831.pdf
    • https://cdn.shopify.com/s/files/1/0433/7352/7203/files/que_es_la_placenta_humana.pdf
    • https://cdn.shopify.com/s/files/1/0429/9436/8663/files/61310896443.pdf
    • https://cdn.shopify.com/s/files/1/0432/1935/3767/files/cape_town_tourist_map.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7352/files/37965316660.pdf
    • https://cdn.shopify.com/s/files/1/0431/8999/3621/files/xatanupixonalat.pdf
    • https://cdn.shopify.com/s/files/1/0432/1509/3924/files/fingerprint_sensor_r307_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/0023/3112/files/36482135138.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_off00004fb9.bin
3b4d82832fb4deaf03e9937110c2727e8aef80667abf71f4bd0e377d1a827621		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FB9 5172 bytes
font_01_sfnt_off00006145.bin
b4501a517ffdd9862c8aeca127563fbebd6d1416311fdc0e81fa607aa26305ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6145 9900 bytes

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