Malicious PDF — malware analysis report

Static analysis result for SHA-256 a01dddc6f8acb56a…

MALICIOUS

PDF

42.9 KB Created: 2020-09-09 09:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9de48156052376cdf8641f0fb7be673 SHA-1: e090a057a321287b41aac2c30ff1172bf2b83892 SHA-256: a01dddc6f8acb56a838ef265e8834166ea6aa2c8a922a3b2f3af7cb993abac34
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and heuristics indicate it contains a malicious redirector link and a large number of external links, suggesting a link farm for phishing or malware distribution. The primary malicious URL identified is https://ttraff.link/wix?keyword=aa+mirror+apk+app. No scripts were extracted from this sample.

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=aa+mirror+apk+app
    • https://static.usrfiles.com/ugd/aa14a9_ad13cf3e85134776b14fc172d42c9e96.pdf
    • https://static.usrfiles.com/ugd/b8c837_11f23be4674c416ebfa7e960a66256f8.pdf
    • https://static.usrfiles.com/ugd/e8dba5_ea226efbaaa8452aada3274dfd0fe6e9.pdf
    • https://static.usrfiles.com/ugd/8b49c6_2afb27535b3343ea85c39369274b0599.pdf
    • https://static.usrfiles.com/ugd/73c254_cc04b295768d48acaedc060038a44b4b.pdf
    • https://static.usrfiles.com/ugd/afe78f_501e0203211b4dcca1f230f7c18de16f.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_1bd7cc23c372442d87263c989469bb1c.pdf
    • https://static.usrfiles.com/ugd/87fdc7_13cacd335681479e87fc80373cf2b0a1.pdf
    • https://cdn.shopify.com/s/files/1/0432/8099/0366/files/55941628123.pdf
    • https://cdn.shopify.com/s/files/1/0433/4541/2245/files/does_he_like_butter_tarts.pdf
    • https://cdn.shopify.com/s/files/1/0431/6699/0502/files/html_admin_template_horizontal_menu.pdf
    • https://cdn.shopify.com/s/files/1/0437/8935/3109/files/67476028640.pdf
    • https://cdn.shopify.com/s/files/1/0438/4869/5958/files/gugobagefevejagar.pdf
    • https://cdn.shopify.com/s/files/1/0427/8878/2236/files/webasidexugupefevutomimix.pdf
    • https://cdn.shopify.com/s/files/1/0432/7853/2761/files/recipe_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/4771/2928/files/47336557681.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_off00006b03.bin
d9e3c9483d2168b7dcbccc75e73db647c7b464d5b8a32ae001aa8a4f9979d85d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B03 4808 bytes
font_01_sfnt_off00007b4a.bin
874894a5f849341de337d02438734eb1186e23c4a8738fcab34832c536fd54d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B4A 10512 bytes