Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b77479c8304f27…

MALICIOUS

PDF

36.7 KB Created: 2020-09-09 14:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6f8382d797e9aed865c217bc4d05a71 SHA-1: 5645f55c55c52721e67502d9b0cca8d120c194ae SHA-256: 86b77479c8304f27febf2b2ce687bc39dcc35fc20f7bb8293cbeca778f6c4c47
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 'https://ttraff.me/wix?keyword=formosa+chinese+restaurant+stafford+va'. This indicates the document's primary purpose is to redirect users to a potentially harmful site. The presence of numerous other links, many hosted on static.usrfiles.com, suggests a link farm or SEO poisoning tactic to increase the visibility of the malicious redirector. 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.me/wix?keyword=formosa+chinese+restaurant+stafford+va
    • https://static.usrfiles.com/ugd/0aab01_cd0439a5a9f5457d94d91e2fa2d52bbe.pdf
    • https://static.usrfiles.com/ugd/faa7ef_84b4db533a354c7d8895268d8553f436.pdf
    • https://static.usrfiles.com/ugd/5ecadc_2d67d2417bf140fe8227f012c0c755e7.pdf
    • https://static.usrfiles.com/ugd/9b5f63_d13b0d59e2904a92abcbf2528e7d4f0f.pdf
    • https://static.usrfiles.com/ugd/9d7ad9_7ba23287294341169bbe7cdbddbfe596.pdf
    • https://static.usrfiles.com/ugd/868401_3c85ae93bc06443d85dc53fe5dd69661.pdf
    • https://static.usrfiles.com/ugd/078c79_720f8486963a4daa8bff04b69805e7af.pdf
    • https://cdn.shopify.com/s/files/1/0460/1954/3199/files/79933474062.pdf
    • https://cdn.shopify.com/s/files/1/0431/1384/0794/files/zafodiwowoduwujumubore.pdf
    • https://cdn.shopify.com/s/files/1/0446/1314/0643/files/space_odyssey_series.pdf
    • https://cdn.shopify.com/s/files/1/0432/8774/0576/files/xojemed.pdf
    • https://cdn.shopify.com/s/files/1/0432/1266/9089/files/kambikuttan_cartoon_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6587/files/20938045904.pdf
    • https://cdn.shopify.com/s/files/1/0429/3243/7151/files/dog_growls_when_playing.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_off000050b1.bin
6954572684562289bdaa774aaf691a2e6ce7f1e8ff49922edf4daa872c1a569b
pdf-font-stream PDF embedded font (sfnt) at offset 0x50B1 5244 bytes
font_01_sfnt_off00006262.bin
151397f80b887b6aa74b8bd149406d05e2e94ce6e74218bd36d89b1ac767a02d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6262 10364 bytes