Malicious PDF — malware analysis report

Static analysis result for SHA-256 827c7e60167a1c81…

MALICIOUS

PDF

46.5 KB Created: 2020-08-29 17:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7cb956a0266ce4db67b1b7c14343e9b3 SHA-1: e850931ba46249948d17ec0b7faaa67d77b54598 SHA-256: 827c7e60167a1c8184563f9cddaf8d650a8fba26ad132c6a1071715d09db0b92
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector infrastructure, ttraff.com, which is disguised as a diet plan. This suggests a phishing or malware distribution attempt. The PDF also hosts a large number of links to other PDFs, likely for SEO manipulation or to spread malicious content. No scripts were extracted, but the presence of malicious links is a strong indicator of malicious intent.

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/wix?keyword=healthy+indian+vegetarian+diet+plan
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_eeb7b8ec05764115b8b8a780d8230f3b.pdf
    • https://static.usrfiles.com/ugd/e2c6c1_d75d105a8deb4e70ae2734adb2a9f194.pdf
    • https://static.usrfiles.com/ugd/b8c837_69cf917caf734bc190fba76d69154479.pdf
    • https://static.usrfiles.com/ugd/b8c837_26b58eef2d594002986b9e92037c8a4b.pdf
    • https://static.usrfiles.com/ugd/b8c837_46a55330e7064069b522c10be6581866.pdf
    • https://static.usrfiles.com/ugd/b8c837_b2e86cd413ae45dab10e03ad0104040a.pdf
    • https://static.usrfiles.com/ugd/ea9bdf_86017adecd9a44e8b8fd815391de67be.pdf
    • https://static.usrfiles.com/ugd/b8c837_6cbe9559c863461eacd58ca2464365d1.pdf
    • https://cdn.shopify.com/s/files/1/0435/6472/8483/files/teaching_cover_letter_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/9620/2652/files/i_will_bless_the_lord_forever_chords.pdf
    • https://cdn.shopify.com/s/files/1/0430/9221/3911/files/bpsc_syllabus_in_english_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/9117/3278/files/xewikobokibolijurul.pdf
    • https://cdn.shopify.com/s/files/1/0431/7170/9092/files/congestive_cardiac_failure.pdf
    • https://cdn.shopify.com/s/files/1/0455/6704/9893/files/assassin_s_creed_rogue_pc_highly_compressed.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076f7.bin
f62357132e57aaf23cbc7c94205649a42f626f5429f2ed3c0fe966554853a7c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x76F7 5164 bytes
font_01_sfnt_off00008883.bin
f89351ab9ffdbd4b1985960e9963a2f35f7bc6c088218c29ca5de21be7ba9582
pdf-font-stream PDF embedded font (sfnt) at offset 0x8883 10796 bytes