Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2aa7425e63bae8…

MALICIOUS

PDF

63.6 KB Created: 2020-08-14 05:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a5e2bbdeea6a6904fb7535ce1b32edf SHA-1: b687dcf1739619139e55b5cd9f025aab18b86e06 SHA-256: 5f2aa7425e63bae833e0d64fc2bed57e4cbce6026cce2e1a2337e8c3d01ccced
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to suspicious or known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs suggest an attempt to drive traffic to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.cc/pify?keyword=boolean+rails+simple_form
    • http://zuwanogib.abundantblessingweddingofficiant.com/uploads/1/3/0/8/130813094/lozapetupixed.pdf
    • http://larav.lagarrigue.co.uk/uploads/1/3/1/8/131856462/4fb1316410b64b.pdf
    • http://files.musicmastertraining.com/uploads/1/3/2/6/132696351/gelokopotajowasajun.pdf
    • http://files.peterthomsonart.com/uploads/1/3/0/9/130969944/1737255.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5013/8784/files/zopinovipo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7149/5574/files/a_dozen_a_day_mini_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/1829/5195/files/26766134030.pdf
    • https://cdn.shopify.com/s/files/1/0431/5863/4658/files/40984996952.pdf
    • https://cdn.shopify.com/s/files/1/0431/0165/1105/files/773_951_7670.pdf
    • https://cdn.shopify.com/s/files/1/0437/5396/3678/files/dextrotartarato_de_brimonidina_bula.pdf
    • https://cdn.shopify.com/s/files/1/0431/3251/8555/files/jedijeguxuvubigis.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/wakekinawakigiromube.pdf
    • https://cdn.shopify.com/s/files/1/0428/1230/9670/files/pudatujonaxefumuvekisixev.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87745409623.pdf
    • https://cdn.shopify.com/s/files/1/0434/2205/6600/files/56407389657.pdf
    • https://cdn.shopify.com/s/files/1/0431/4277/4935/files/repugizumajefi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b4a.bin
2a179f61ee1ae8eeb4cd0fb94db73a30be44a422ba5a7369c31c68ff17f99808		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B4A 17080 bytes
font_01_sfnt_off0000a191.bin
aa7ac975c1ceefaff9575c3476770f318fd34f57c5450695db81c99cc178485c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA191 5128 bytes
font_02_sfnt_off0000b2e8.bin
50b09f5083493146c63c5569c22eb97fe355562360ca54709905900640d5138c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E8 1744 bytes
font_03_sfnt_off0000bb86.bin
d9155a35d7b9e2825ae9128a0bbe82e3ccde48204e94a7ef708850417a766a21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB86 16416 bytes

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