Malicious PDF — malware analysis report

Static analysis result for SHA-256 2028bc05bf80d43d…

MALICIOUS

PDF

42.2 KB Created: 2020-08-25 15:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1825970c041d63aff93b39cf93bbd6a4 SHA-1: 410fef5cbb6853ff6533c2f72eb46a683c4adf2b SHA-256: 2028bc05bf80d43dd56e973e2cfe0523fbc45ad74383d0e70f110291ae0d7252
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, contains the same URL and keywords suggesting a lure for "ccna security practice labs pdf". The presence of a large number of external PDF links, many hosted on cdn.shopify.com, indicates a link farm strategy. The ML classifier also 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.com/pify?keyword=ccna+security+practice+labs+pdf
    • http://files.doulanathalie.com/uploads/1/3/1/4/131437864/pozomitapike.pdf
    • http://files.bellacalore.com/uploads/1/3/0/8/130814279/mumubimogamu-fupedevumebat-ropetiwajo.pdf
    • http://files.nationalmustangday.com/uploads/1/3/0/7/130739147/satofurog.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2392/files/78544918680.pdf
    • https://cdn.shopify.com/s/files/1/0437/0091/2278/files/ayodhya_kanda_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/joreremibula.pdf
    • https://cdn.shopify.com/s/files/1/0450/8984/9509/files/o_meio_ambiente.pdf
    • https://cdn.shopify.com/s/files/1/0438/6213/0848/files/17458594819.pdf
    • https://cdn.shopify.com/s/files/1/0428/7237/3411/files/28001175543.pdf
    • https://cdn.shopify.com/s/files/1/0433/3328/8088/files/pm_awas_yojana_gramin_online_form_2019.pdf
    • https://cdn.shopify.com/s/files/1/0430/3680/3233/files/2480898912.pdf
    • https://cdn.shopify.com/s/files/1/0432/8207/1716/files/67252996340.pdf
    • https://cdn.shopify.com/s/files/1/0430/4371/7274/files/bioelectronics_book.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_off0000664f.bin
739be8c7618918329bacfa6101468deea676753c64902f173e28294c2c5f6125
pdf-font-stream PDF embedded font (sfnt) at offset 0x664F 5296 bytes
font_01_sfnt_off0000784f.bin
684f4bbad0461a64964931522c563f1b44591f28883f3644f58d70fcdf5540fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x784F 10376 bytes