Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9d587e877b3926…

MALICIOUS

PDF

53.0 KB Created: 2020-08-31 13:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c79984ee6229e9802fd9ec860bb3d66d SHA-1: 17d6ad03c9ac3ac59b8bdc65edee87bf93821fd8 SHA-256: bf9d587e877b39269d487a524ea867bea18864db2b4e64c1accc187ba99def68
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to benign Shopify domains, but one critical link directs to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to a Qualcomm Atheros driver, suggesting a lure to disguise the malicious intent. The primary malicious IOC is the redirector URL, which likely leads to a phishing page or malware download.

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=qualcomm+atheros+ar8151+pci-e+gigabit+ethernet+controller+driver
    • https://cdn.shopify.com/s/files/1/0433/3862/9275/files/27215385696.pdf
    • https://cdn.shopify.com/s/files/1/0437/7998/1470/files/blender_for_win7_32_bit.pdf
    • https://cdn.shopify.com/s/files/1/0428/8118/8003/files/25465509295.pdf
    • https://cdn.shopify.com/s/files/1/0430/0944/1953/files/appeal_letter_template_for_speeding.pdf
    • https://cdn.shopify.com/s/files/1/0430/7537/1162/files/sixoxavo.pdf
    • https://static.usrfiles.com/ugd/0f1814_97aac2d74f0f42708622799593e5dd3e.pdf
    • https://static.usrfiles.com/ugd/565485_fe378fc7580f4a8a9ba96cefd02b4d31.pdf
    • https://static.usrfiles.com/ugd/b8c837_c0b45965979a4c90a5296df37cb5cf00.pdf
    • https://cdn.shopify.com/s/files/1/0432/0477/1999/files/xevinowu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5502/2234/files/ielts_writing_tips_and_tricks.pdf
    • https://cdn.shopify.com/s/files/1/0429/9993/9235/files/zudegubogamigosep.pdf
    • https://cdn.shopify.com/s/files/1/0434/7772/9430/files/vujujatitedaletupij.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ae7.bin
c7112afcfe5c1d981087a9eb9b758f3148b90622553378e93d48447b7e15346e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AE7 8544 bytes
font_01_sfnt_off000077b0.bin
812852e688ffa3a21265820b37f4492ab38b575c021a6cab8ac891f462875c09
pdf-font-stream PDF embedded font (sfnt) at offset 0x77B0 6152 bytes
font_02_sfnt_off00008c7b.bin
a7ef14f66685b04133d91c114074165eb91f67f5deb9609c6e8a7768208e9242
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C7B 12756 bytes
font_03_sfnt_off0000b5f3.bin
45c19ef5fab2a2212c12c9d0ecdcd3a6f4d3b80f0e3228e74325442b1d47cf9a
pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F3 4048 bytes