Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a2c46b2dad83f6a…

MALICIOUS

PDF

44.7 KB Created: 2020-08-14 13:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0993e50a01a0d738eaa8a1dc6b7cab9 SHA-1: 73650fc363763bedc39300d0a47eb3830a8ff253 SHA-256: 5a2c46b2dad83f6a11a99d304a39afa1481b61d8000ee8ba77dfd76610fc457d
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to a redirector service known to host malicious content. The document body and heuristics suggest a lure related to document signing services, aiming to trick users into clicking these malicious links. The presence of a link farm and a redirector indicates an attempt to distribute further malicious content or phishing pages.

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.
  • Document signing service impersonation lure medium SE_DOCUSIGN_LURE
    Document impersonates DocuSign, Adobe Sign, or a similar signing service in a signing-request context
  • 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.ru/pify?keyword=adobe+acrobat+pro+2017++windows
    • http://nemalinos.francisweller.net/uploads/1/3/1/4/131454526/jenoj_gozifexisomo_samusol_vimaxarufes.pdf
    • http://files.duachmusic.com/uploads/1/3/1/6/131606373/96557275cd.pdf
    • http://files.aleighacisrael.com/uploads/1/3/0/7/130740118/kupojamobefawe_sipijabat_vosakimumab_nolesosugamiwi.pdf
    • http://files.christianhartsough.com/uploads/1/3/0/8/130873903/1240921.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9573/6988/files/1809500906.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/apa_table_example.pdf
    • https://cdn.shopify.com/s/files/1/0430/5692/2777/files/43901866098.pdf
    • https://cdn.shopify.com/s/files/1/0436/1093/1358/files/aprendizagem_colaborativa_livro.pdf
    • https://cdn.shopify.com/s/files/1/0437/4321/5767/files/86797601530.pdf
    • https://cdn.shopify.com/s/files/1/0434/2756/1621/files/revofemusowif.pdf
    • https://cdn.shopify.com/s/files/1/0434/1393/0142/files/venukikobigasevopot.pdf
    • https://cdn.shopify.com/s/files/1/0428/9455/7350/files/gipuxabanedifoniwiriro.pdf
    • https://cdn.shopify.com/s/files/1/0432/1044/0862/files/lenubu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3826/0903/files/45880052012.pdf
    • https://cdn.shopify.com/s/files/1/0431/6676/1120/files/danigufani.pdf
    • https://cdn.shopify.com/s/files/1/0431/7613/2774/files/cooks_essentials_pressure_cooker.pdf
    • https://cdn.shopify.com/s/files/1/0434/9663/6580/files/66586708249.pdf
    • https://cdn.shopify.com/s/files/1/0428/0716/5095/files/xemasujakunexipulupelov.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006218.bin
e60154ca4904019f36d3bcaf954b944628265f38a95a421d94bb978dd23e3b39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6218 5452 bytes
font_01_sfnt_off000074bf.bin
d2b47559a46f35c52acb52f61426d7e77b9661790ec7b3af6738ee3bbaa7d2e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74BF 10180 bytes
font_02_sfnt_off000097aa.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97AA 4324 bytes

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