Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b24169fa3a6817…

MALICIOUS

PDF

44.4 KB Created: 2020-08-19 01:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e63437abde9ea7bfc60b9ac48dba996 SHA-1: 1204ed8a21b8a89445192cde2f2dbf56a60c6f8a SHA-256: 72b24169fa3a6817d7da2a1acb5cc7439efc4cff1086913d2b074f2d7a777859
194 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a malicious redirector link, which is also present in the document body. The primary malicious link appears to be a lure for 'Apartment 1303 imdb parents guide', likely designed to trick users into clicking through to a malicious site.

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.com/pify?keyword=apartment+1303+imdb+parents+guide
    • http://files.revearljackson.com/uploads/1/3/0/8/130813427/4023271.pdf
    • http://files.empachernorthamerica.com/uploads/1/3/2/8/132814241/5471388.pdf
    • http://files.citizenstoabolishredlightcameras.com/uploads/1/3/1/3/131380546/kisovoloti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/8015/5290/files/zikox.pdf
    • https://cdn.shopify.com/s/files/1/0435/7799/9519/files/clinical_pharmacy_by_parthasarathy_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/0527/0427/files/weight_loss_smoothie_diet_plan.pdf
    • https://cdn.shopify.com/s/files/1/0432/5398/9534/files/tratamento_de_meningite_bacteriana.pdf
    • https://cdn.shopify.com/s/files/1/0439/8107/8686/files/s1_fancy_svg.pdf
    • https://cdn.shopify.com/s/files/1/0430/9532/6887/files/janodakenapebakuwiwo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8660/1639/files/dna_polymerase.pdf
    • https://cdn.shopify.com/s/files/1/0435/3766/2103/files/absolute_value_equations_word_problems_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/3305/9737/files/kalozobeninafitiwi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2429/3796/files/fanevonitiparupuludo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0649/2823/files/nezejediwatukija.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_off000060d9.bin
14a27eb05a2aadd14b40786b2f328d2acdfbb93e2dd7ddc5031fc88670602d3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60D9 5504 bytes
font_01_sfnt_off00007360.bin
a07b7101d624b4a662119540dfd2311237f19d750e68c326ab9ba3c7fdfa1506		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7360 10288 bytes
font_02_sfnt_off00009695.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9695 4324 bytes

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