Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54ef4f6916a10d3…

MALICIOUS

PDF

47.3 KB Created: 2020-08-31 11:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5494ad3b89e27d44c84b25c509a44db SHA-1: 2c576bf6f9966b71bd91318d09d80cb3ee280234 SHA-256: a54ef4f6916a10d3c487ff70621f26ad4a586769c623445b7201fed889c2dd3a
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be tricking the user into clicking the embedded malicious link, which leads to further malicious infrastructure.

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=dr+douglas+arbulo+reclamos
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46552055365.pdf
    • https://cdn.shopify.com/s/files/1/0433/6533/5208/files/sototiwadow.pdf
    • https://cdn.shopify.com/s/files/1/0432/3665/5259/files/how_to_call_a_class_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0431/6158/3776/files/boverakuxibiva.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zosogorimojafi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7257/7946/files/tupuvojuzil.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/c_sharp_date_format_yyyy-_mm-_dd.pdf
    • https://cdn.shopify.com/s/files/1/0430/7668/1882/files/wexunoxovenuna.pdf
    • https://static.usrfiles.com/ugd/8127dd_e37b7d75e5c1434baa6bcccd18184c11.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd0ce4da3a354f04baf23d742bfe07a9.pdf
    • https://static.usrfiles.com/ugd/b7082a_ee495b5293cc4364a97f7cf1edf2edd0.pdf
    • https://cdn.shopify.com/s/files/1/0437/2273/5765/files/army_initial_counseling.pdf
    • https://cdn.shopify.com/s/files/1/0432/2544/8615/files/jpg2pdf_software_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3643/files/lifurulatigigo.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_off00006498.bin
32e7c2e5f2d65cfba43176db269db771e535f6f1e2fb50eaafaac5860c9ba94f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6498 6592 bytes
font_01_sfnt_off00007abf.bin
34e29b9f8a7de2ffd2b7e7244190a896d68b3fc4791c0643052bfa0a1054a174
pdf-font-stream PDF embedded font (sfnt) at offset 0x7ABF 5396 bytes
font_02_sfnt_off00008d00.bin
c04fe49ecf3a843287684a451b48eaa23e71cb68a439ad768ec091ac2172511d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D00 10248 bytes