Malicious PDF — malware analysis report

Static analysis result for SHA-256 45768d8235862fa4…

MALICIOUS

PDF

45.6 KB Created: 2020-08-18 16:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0857a2cc7f5fb72211f261f8cd068a35 SHA-1: 5a2c16f24123dd62b3d83bceed7894a4af0b4897 SHA-256: 45768d8235862fa47c87f00120c18f7e5757c3a09a97e2c0fd12aafd435abead
160 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link and a large number of external PDF links, suggesting a link farm or SEO poisoning attempt. The document body, though heavily obfuscated, contains text related to 'affect vs effect worksheet pdf' and the malicious URL https://ttraff.cc/pify?keyword=affect+vs+effect+worksheet+pdf, indicating a lure to a malicious site. The presence of a remote-support tool lure heuristic further suggests a social engineering tactic to gain user trust or access.

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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.cc/pify?keyword=affect+vs+effect+worksheet+pdf
    • http://files.alyssavanlandingham.com/uploads/1/3/0/7/130739688/rosisaj_xofiloganal_vojadoredejikuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/1804/4063/files/77606140484.pdf
    • https://cdn.shopify.com/s/files/1/0430/3680/3233/files/aciduria_metilmalonica.pdf
    • https://cdn.shopify.com/s/files/1/0440/6971/6118/files/sokowe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/91337380597.pdf
    • https://cdn.shopify.com/s/files/1/0429/6821/9799/files/9744404843.pdf
    • https://cdn.shopify.com/s/files/1/0431/2023/0564/files/revipobamaseb.pdf
    • https://cdn.shopify.com/s/files/1/0447/9614/9921/files/oligopoly_and_monopoly.pdf
    • https://cdn.shopify.com/s/files/1/0430/7301/1866/files/makalah_medan_magnet.pdf
    • https://cdn.shopify.com/s/files/1/0432/5811/8312/files/basic_english_grammar_test_bank.pdf
    • https://cdn.shopify.com/s/files/1/0430/9309/8660/files/tetukefok.pdf
    • https://cdn.shopify.com/s/files/1/0428/2017/3983/files/zogawolelugesufezeradin.pdf
    • https://cdn.shopify.com/s/files/1/0434/1471/6572/files/periodic_table_elements_name_list.pdf
    • https://cdn.shopify.com/s/files/1/0435/0427/1524/files/korafamamodubaneligid.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_off000074f4.bin
599bfcd74cbd8a3829d8ca44d123dd610d1a011c53004f82be629049c26be87c
pdf-font-stream PDF embedded font (sfnt) at offset 0x74F4 5208 bytes
font_01_sfnt_off000086bf.bin
a91434d2606120366c34c558d3ece57a1af32e1374f929598c8fef63fa40bb32
pdf-font-stream PDF embedded font (sfnt) at offset 0x86BF 10192 bytes