Malicious PDF — malware analysis report

Static analysis result for SHA-256 39db8553c1be85d2…

MALICIOUS

PDF

42.1 KB Created: 2020-08-10 05:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a0b84f6eb5a1a865dfbd503123a61cb SHA-1: 0afb9158f7f445155cf2f8b5b6490ebb3ad03f85 SHA-256: 39db8553c1be85d2db400e2286bdff29113d96c4e298f54d7fa9cd7a0d13f18a
120 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one critical heuristic identifying a link to a known malicious redirector. The document body, though partially corrupted, contains text suggesting a lure for downloading a PDF, further supported by the malicious redirector URL. The primary attack pattern involves tricking the user into clicking the malicious link, likely leading to further compromise.

Heuristics 3

  • 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.
  • 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/pify?keyword=jaypee+biochemistry+pdf+download
    • http://files.evvtrinityumc.org/uploads/1/3/2/8/132814182/wuxusobo.pdf
    • http://lolij.pahasapagrotto.com/uploads/1/3/0/9/130968921/f2adacffd5717b.pdf
    • http://files.menshairreplacementnc.com/uploads/1/3/1/6/131606186/6910067.pdf
    • https://cdn.shopify.com/s/files/1/0432/4291/3952/files/89997465413.pdf
    • https://cdn.shopify.com/s/files/1/0427/4677/3660/files/15924440662.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/vikalixenegoxafuwufe.pdf
    • https://cdn.shopify.com/s/files/1/0436/4101/2382/files/92614762575.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20597849085.pdf
    • https://cdn.shopify.com/s/files/1/0429/9948/0473/files/kirupotanojokobamunaweno.pdf
    • https://cdn.shopify.com/s/files/1/0431/0768/0405/files/fuvojowulipetaxomimuxu.pdf
    • https://cdn.shopify.com/s/files/1/0436/1161/9491/files/barron_s_gre_word_book.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/star_wars_action_figures_price_guide_2015.pdf
    • https://cdn.shopify.com/s/files/1/0430/6331/2535/files/mental_health_among_adolescent.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8178/files/fe_mechanical_review_manual_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/9246/7109/files/waneberonimisatatika.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005916.bin
df0e01bb5aec40ad0525f327b10bbc764de40fb98bc93987f880d028c0a2ff6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5916 5504 bytes
font_01_sfnt_off00006bac.bin
cf715d835c1f3a9ecf941da5c85b0227820fe39ccabba364620e43c8cfa83a54
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BAC 9964 bytes
font_02_sfnt_off00008db5.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DB5 4324 bytes