Malicious PDF — malware analysis report

Static analysis result for SHA-256 c927564852df7806…

MALICIOUS

PDF

40.4 KB Created: 2020-09-16 18:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e015a9878eba772de8b91dac8ce649cc SHA-1: 6d849af1bec0ccb3eb1bd8485680c987f9cc721c SHA-256: c927564852df780604e7122182de432ebbdea5deeac1b1b282c96f2c57668d5c
154 Risk Score

Malware Insights

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

The PDF contains a document body and embedded links that are designed to lure the user into downloading an APK file. It leverages a malicious redirector and a large number of SEO spam links to obscure the true destination. The ML classifier strongly indicated maliciousness.

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.club/wix?keyword=torrent+apk+download+for+jio+phone
    • http://mazam.twitterforsocialworkers.com/uploads/1/3/0/8/130813557/3353817.pdf
    • http://musovut.skeshmm.com/uploads/1/3/1/4/131453540/38156fc97ac.pdf
    • http://lofiko.lakehillshoa.com/uploads/1/3/1/3/131383323/geded_masuxaremalazal_mumobazere.pdf
    • http://files.ridelcc.com/uploads/1/3/1/4/131483371/naxugex.pdf
    • http://kudox.christinamhiggins.com/uploads/1/3/2/6/132695675/burulen.pdf
    • http://files.mprints.shop/uploads/1/3/2/6/132695730/ca93609700.pdf
    • http://files.laurelbankhouse.com/uploads/1/3/2/3/132303219/fexiwesulibikun-wiluliro.pdf
    • http://tejor.anaelisamiranda.com/uploads/1/3/1/8/131856333/b8e7f4.pdf
    • http://fogazotu.oregondunestriathlon.com/uploads/1/3/1/3/131380160/296c1871ab6e.pdf
    • https://fb0283d6-50be-48cc-b989-59d05e36dd6a.filesusr.com/ugd/78daac_313ff3c235554bd1a30ce30b1c15e4e7.pdf?index=true
    • https://6239da51-b251-4d2d-8db0-95751737abc3.filesusr.com/ugd/cb2bed_1c675f488d4742cb97ecce0735da16ec.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0430/2045/1997/files/baal_veer_1037.pdf
    • https://cdn.shopify.com/s/files/1/0462/0831/9641/files/plus_prs_de_la_vrit_transcription.pdf
    • https://cdn.shopify.com/s/files/1/0430/9614/6073/files/bt_email_problems_on_android.pdf
    • https://cdn.shopify.com/s/files/1/0429/7667/3946/files/65158978508.pdf
    • https://cdn.shopify.com/s/files/1/0428/7932/0223/files/caliban_s_war_online.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_off00005f24.bin
e4a62875bbb2eda6720c78aa1bd8411d9de6b9c91c8d05e172021d206be7879a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F24 5132 bytes
font_01_sfnt_off000070ac.bin
1bb694097a43a69a75876fbf38fe35fc3bfbaf8ea3cc24398a67b8a49b4f0685
pdf-font-stream PDF embedded font (sfnt) at offset 0x70AC 10440 bytes